CN-120875238-B - Mining method of brine type lithium potassium boron deposit in front land basin carbonate stratum

Abstract

The application provides a prospecting method of a brine type lithium potassium boron ore deposit of a front land basin carbonate stratum, which comprises the steps of determining a mineral formation potential construction unit type, determining a mineral formation brine supply potential source type, determining an advantageous mineral formation construction unit type, calculating a comprehensive evaluation coefficient of the construction unit, screening an advantageous exploration construction unit, analyzing a mineral formation brine carbonate reservoir of the advantageous exploration construction unit, defining an advantageous exploration target area, carrying out drilling verification on the advantageous exploration target area, and evaluating the economic value of the advantageous exploration target area. The application realizes multi-level prospecting prediction from the full basin scale optimal construction unit to the local target area fine evaluation, and obviously improves the prospecting efficiency and success rate of the brine type lithium potassium boron deposit.

Inventors

• WANG CHUNLIAN
• YAN KAI
• XU YANG
• LIU XUE
• LIU YANTING
• WANG HUAN
• Xu Guoyiji
• YU XIAO
• XU QIAN
• FENG ZHIBING
• DING TING
• JIANG LI
• DING JIAN
• LIU LIHONG
• WANG JIUYI
• Yu Xiaocan
• SHEN LIJIAN

Assignees

• 东华理工大学南昌校区
• 中国地质科学院矿产资源研究所
• 中国地质调查局油气资源调查中心

Dates

Publication Date

20260512

Application Date

20250711

Claims (6)

1. 1. A method for prospecting a brine type lithium potassium boron deposit in a front land basin carbonate formation, comprising the steps of: Analyzing the carbonate stratum at the full basin scale to determine the type of the potential building unit; carrying out ore-forming brine source analysis on the basin scale to determine the type of ore-forming brine supply potential source; Carrying out ore-forming brine migration path analysis on the basin scale to determine the type of the favorable ore-forming construction unit; Calculating a comprehensive evaluation coefficient of the construction unit based on the type of the construction unit with potential of forming ores, the type of potential source of brine supply of the formation ores and the type of the construction unit with potential of forming ores, and screening the construction unit with potential of exploration; Carrying out ore-forming brine carbonate reservoir analysis on the favorable exploration construction unit to delineate a favorable exploration target area; performing drilling verification on the favorable exploration target area, and evaluating the economic value of the favorable exploration target area; The determining the type of the mineralisation potential building unit comprises: acquiring global ancient climate data and determining a prospecting target layer of a front land basin; remote sensing interpretation is carried out on the front land basin, field outcrop investigation and analysis are carried out, and an outcrop-underground horizon corresponding relation is established; analyzing the seismic data and logging data of the front land basin, and describing carbonate stratum spreading, lithology combination and reservoir space; comprehensively evaluating the formation development characteristics and the mineralization potential of the carbonate rock, and determining the type of a front land basin mineralization potential construction unit; The determining the type of mineral brine supply potential source comprises: determining normal faults and deep breaks of the front land basin; performing ground temperature analysis on the structural units where the normal fault and the deep fracture are located, and determining the types of the structural units favorable for ore formation; The positive fault and the deep fracture are integrated, the type of a structural unit of the ore formation is facilitated, and the type of a potential source of ore formation brine supply is determined; The determining of the advantageous mineforming building unit type includes: determining structural units which are in a low-lying area of a migration path for a long time since formation of a carbonate stratum as a 1-class favorable mineralization structural units; Judging a structural unit in a low-lying area of a migration path when a carbonate stratum is formed as a b 1-class favorable mineralization structural unit; the construction unit passing through the ore-forming brine migration path is judged to be a c 1-class favorable ore-forming construction unit; the screening of the advantageous exploration building units comprises: The comprehensive evaluation coefficient of the construction unit is calculated, the method comprises the following steps: , Wherein, the Representing the comprehensive evaluation coefficient of the construction unit; Representing assignment of the type of the potential building unit; indicating the supply of ore-forming brine potential source type assignment; Representing favorable mineform unit type assignment; the method comprises the steps of screening a favorable exploration construction unit according to comprehensive evaluation coefficients of the construction unit, wherein the construction unit can be used for carrying out ore potential evaluation preferentially if 4<M is less than or equal to 5, carrying out ore potential evaluation if 3<M is less than or equal to 4, not carrying out ore potential evaluation if 2<M is less than or equal to 3, and carrying out ore potential evaluation preferentially and carrying out ore potential evaluation.
2. 2. The method of claim 1, wherein determining the prospecting target layer of the front land basin comprises: acquiring global paleoclimate data, and screening drought events and duration time which are experienced in an evolution stage before Liu Pen is formed; if the carbonate rock land layer is formed in an extremely arid ancient climate environment, the carbonate rock land layer is a high-quality prospecting target layer; if the carbonate rock land layer is formed in drought-semiarid ancient climatic environment, the carbonate rock land layer is a good prospecting target layer; If the carbonate rock ground level is formed in a warm humid paleo-climatic environment, the carbonate rock ground level is a potential prospecting target level.
3. 3. The method of claim 2, wherein determining a front land basin mineralisation potential building unit type comprises: For shallow carbonate strata with a depth of 200m, the high-quality prospecting target layer is exposed in a large area, and a structural unit for crack-solution hole development is determined as an a1 type mineral potential structural unit, the high-quality prospecting target layer is exposed locally, and a structural unit with middle-low permeability is determined as a b1 type mineral potential structural unit, the good prospecting target layer is exposed in a large area, and the structural unit for crack-solution hole development is determined as a b2 type mineral potential structural unit, the good prospecting target layer is exposed locally, and the structural unit with middle-low permeability is determined as a c1 type mineral potential structural unit, the potential prospecting target layer is exposed in a large area, and the structural unit for crack-solution hole development is determined as a c2 type mineral potential structural unit; For a medium-deep buried carbonate stratum with the burial depth of 200-500m, a high-quality ore-finding target layer is partially exposed, a constructional unit widely developed in a deep part is determined to be an a 1-type ore-forming potential constructional unit, a constructional unit widely developed in the deep part of the high-quality ore-finding target layer except the a 1-type ore-forming potential constructional unit is determined to be an a 2-type ore-forming potential constructional unit, a constructional unit widely developed in the deep part of the high-quality ore-finding target layer is determined to be a b 1-type ore-forming potential constructional unit, a constructional unit widely developed in the deep part of the good ore-finding target layer is determined to be a b 2-type ore-forming potential constructional unit, and a constructional unit widely developed in the deep part of the good ore-finding target layer is determined to be a c 1-type ore-forming potential constructional unit; For a deep carbonate stratum with a depth of 500m, determining a constructional unit which is widely developed in a deep part of a high-quality prospecting target layer as an a 1-type mineral potential constructional unit, determining a constructional unit which is widely developed in a deep part of the high-quality prospecting target layer as a b 2-type mineral potential constructional unit, determining a constructional unit which is widely developed in a deep part of the high-quality prospecting target layer as a c 1-type mineral potential constructional unit, and determining a constructional unit which is widely developed in a deep part of the high-quality prospecting target layer as a c 2-type mineral potential constructional unit.
4. 4. The method according to claim 1, characterized in that the formation units where normal faults and deep breaks are located are subjected to a geothermal analysis, determining the type of formation units that are favourable for mineralization, in particular: Calculating the normal temperature of the mining target layer according to the mining target layer burying depth and the annual average surface temperature; collecting geophysical well logging data of a structural unit where a normal fault and a deep fracture are located, analyzing well temperature data in the geophysical well logging data, and determining well temperature of a prospecting target layer; If the well temperature of the prospecting target layer is greater than 140% of the normal temperature, dividing the structural unit where the normal fault and the deep fracture are located into structural units which are advantageous for mineral formation; If the well temperature of the prospecting target layer is more than 120% of the normal temperature and less than or equal to 140% of the normal temperature, dividing the structural unit where the normal fault and the deep fracture are located into good favorable mineralizing structural units; if the well temperature of the prospecting target layer is less than or equal to 120% of the normal temperature, dividing the structural unit where the normal fault and the deep fracture are located into general favorable mineral formation structural units.
5. 5. The method according to claim 4, wherein the determination of the source type of mineral brine supply potential is performed by combining normal fault and deep fracture with the type of favorable mineral formation unit, in particular: in the advantage, the deep fracture and positive fault development in the inside and the periphery of the mineralized building unit are facilitated, and the deep part of the building unit is judged to be a potential source for supplying the mineralized brine to the a1 type; in the advantage, the deep fracture and normal fault development in and around the mineralized construction unit are facilitated, and the deep part of the construction unit is judged to be a potential source for supplying the mineralized brine to b1 class; in the good and favorable deep fracture and positive fault development of the inside and the periphery of the mineralized structural unit, judging that the deep part of the structural unit is a potential source for supplying the mineralized brine to b2 types; In the good and favorable ore-forming construction unit and the deep fracture and normal fault development around the construction unit, judging that the deep part of the construction unit is a potential source for supplying ore-forming brine to the c1 class; And (3) judging that the deep part of the building unit is a potential source of c2 ore-forming brine supply when deep fracture and normal fault in and around the potentially beneficial ore-forming building unit develop very well.
6. 6. The method of claim 1, wherein defining the favorable exploration target comprises performing geologic interpretation on seismic data of the favorable exploration building units, identifying key structural features, detecting fracture zones and lithology changes in combination with attribute analysis techniques, and preliminarily predicting pore zones by means of wave impedance inversion, screening structural conversion zones, paleomorphic high sites and special structural combination zones, and verifying reservoir conditions and capping effectiveness of the structural conversion zones, paleomorphic high sites and special structural combination zones in combination with regional geologic data, and finally defining the favorable exploration target with structural-reservoir configuration advantages.

Description

Mining method of brine type lithium potassium boron deposit in front land basin carbonate stratum Technical Field The application relates to the technical field of geological exploration of potassium-lithium-boron ore deposits, in particular to a prospecting method of a brine type lithium-potassium-boron ore deposit of a front land basin carbonate stratum. Background With the rapid development of new energy, modern agriculture and high-end manufacturing industry, the demand of strategic mineral resources such as lithium, potassium, boron and the like is in explosive growth. While the traditional solid ore deposit is limited by factors such as grade reduction, ecological environment constraint and the like, the resource supply faces serious challenges, and the deep brine liquid ore deposit becomes an important break-over for the resource supply system change due to the advantages of in-situ green exploitation characteristics and low environmental disturbance. The front land basin carbonate stratum is an advantage occurrence carrier of brine type mineral products, and is subjected to the action of structural extrusion-hydrothermal circulation coupling to form a penetrating erosion hole seam system which is combined with a cream salt rock cover layer to form a brine type mineral product 'transportation-storage-closure' integrated ore geological structure. However, deep brine ore bodies lack surface geochemical identification and traditional mineral exploration target area delineation methods fail. Therefore, the method is necessary to realize accurate detection of deep brine resources around key mineral elements, and an applicable investigation method is preferred, so that the method has important scientific significance and engineering value. Disclosure of Invention Aiming at the problems existing in the prior art, the application provides a method for searching a brine type lithium potassium boron deposit in a front land basin carbonate stratum, which comprises the following steps: Analyzing the carbonate stratum at the full basin scale to determine the type of the potential building unit; carrying out ore-forming brine source analysis on the basin scale to determine the type of ore-forming brine supply potential source; Carrying out ore-forming brine migration path analysis on the basin scale to determine the type of the favorable ore-forming construction unit; Calculating a comprehensive evaluation coefficient of the construction unit based on the type of the construction unit with potential of forming ores, the type of potential source of brine supply of the formation ores and the type of the construction unit with potential of forming ores, and screening the construction unit with potential of exploration; Carrying out ore-forming brine carbonate reservoir analysis on the favorable exploration construction unit to delineate a favorable exploration target area; And (5) carrying out drilling verification on the favorable exploration target area, and evaluating the economic value of the favorable exploration target area. Further, determining the mineralogical potential building block type comprises: acquiring global ancient climate data and determining a prospecting target layer of a front land basin; remote sensing interpretation is carried out on the front land basin, field outcrop investigation and analysis are carried out, and an outcrop-underground horizon corresponding relation is established; analyzing the seismic data and logging data of the front land basin, and describing carbonate stratum spreading, lithology combination and reservoir space; and comprehensively evaluating the formation development characteristics and the mineralization potential of the carbonate rock, and determining the type of the front land basin mineralization potential building unit. Further, determining the prospecting target layer of the front land basin comprises: acquiring global paleoclimate data, and screening drought events and duration time which are experienced in an evolution stage before Liu Pen is formed; if the carbonate rock land layer is formed in an extremely arid ancient climate environment, the carbonate rock land layer is a high-quality prospecting target layer; if the carbonate rock land layer is formed in drought-semiarid ancient climatic environment, the carbonate rock land layer is a good prospecting target layer; If the carbonate rock ground level is formed in a warm humid paleo-climatic environment, the carbonate rock ground level is a potential prospecting target level. Further, determining the front land basin mineralisation potential building unit type comprises: For shallow carbonate strata with a depth of 200m, the high-quality prospecting target layer is exposed in a large area, and a structural unit for crack-solution hole development is determined as an a1 type mineral potential structural unit, the high-quality prospecting target layer is exposed locally, and a structural unit with middle-lo