CN-122018033-A - Multi-information fusion grey sandstone reservoir evaluation method

CN122018033ACN 122018033 ACN122018033 ACN 122018033ACN-122018033-A

Abstract

The invention belongs to the field of petroleum development, in particular relates to a multi-information fusion grey sandstone reservoir evaluation method, and aims to solve the problem of low coincidence rate of the grey sandstone reservoir evaluation method in the prior art. The method comprises the steps of judging whether a sandstone reservoir has a reservoir forming condition based on whether the sandstone reservoir has a high point of construction, sand development and oil source faults, judging whether the sandstone reservoir has reservoir effectiveness based on whether matrix voids of the sandstone reservoir are larger than a first threshold value and whether depth resistivity, medium resistivity and shallow resistivity of cracks of the sandstone reservoir have amplitude differences, judging first oiliness of the sandstone reservoir based on rock debris color of the sandstone reservoir, judging second oiliness of the sandstone reservoir, and judging that the sandstone reservoir is oiliness when the sandstone reservoir has the reservoir forming condition and has the reservoir effectiveness and the first oiliness and the second oiliness. The invention improves the interpretation coincidence rate of the gray sandstone reservoir.

Inventors

LIN XUECHUN
DING YUJIAO
Ren Shulian
SHAO YANG
TIAN YUN
HUANG YANJIE
LIU AIPING
ZHANG YANJUN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. A multi-information fusion gray sandstone reservoir evaluation method, comprising the steps of: Judging whether the sandstone reservoir has a reservoir forming condition based on whether the sandstone reservoir has a high point of construction, sand development and oil faults; Determining whether the sandstone reservoir has reservoir effectiveness based on whether the matrix void of the sandstone reservoir is greater than a first threshold and whether the depth resistivity, the medium resistivity, the shallow resistivity of the fracture of the sandstone reservoir have an amplitude difference; judging a first oiliness of the sandstone reservoir based on a cuttings color of the sandstone reservoir; judging the second oiliness of the sandstone reservoir based on the magnitude of the gas-measured total hydrocarbon peak ratio, the magnitude of the ethane-to-propane ratio, the gas-measured total hydrocarbon peak time lapse and the gas-measured component ratio, and the derived parameter ratio of the sandstone reservoir; and judging that the sandstone reservoir is oily when the sandstone reservoir has a reservoir forming condition and has reservoir effectiveness, wherein the first oiliness of the sandstone reservoir is oily, and the second oiliness of the sandstone reservoir is oily, otherwise, judging that the sandstone reservoir is non-oily.
2. The multi-information fusion gray sandstone reservoir evaluation method of claim 1, wherein the method for judging whether the sandstone reservoir has a reservoir-forming condition is as follows: If the difference value of the geological height of the sandstone reservoir and the geological height of the surrounding area is larger than a second threshold value, the sandstone reservoir is provided with a high point; if the scale of the sandstone body of the sandstone reservoir is greater than a third threshold, the sandstone reservoir develops; if the sandstone reservoir has high points of construction, sand development and oil source faults at the same time, the sandstone reservoir has a reservoir formation condition.
3. The multi-information fusion gray sandstone reservoir evaluation method of claim 2, wherein the method of calculating the matrix voids of the sandstone reservoir is: Wherein ΦA is the porosity of the matrix, Δt is the target interval-time logging value of the acoustic wave, Δt ma is the interval-time of the acoustic wave of the rock skeleton, Δt f is the interval-time of the acoustic wave of the formation fluid, and C p is the compaction correction coefficient.
4. The multi-information fusion gray sandstone reservoir evaluation method of claim 3, wherein the method for judging whether the sandstone reservoir has reservoir validity is as follows: if the matrix void of the sandstone reservoir is greater than a first threshold and the depth resistivity, the medium resistivity, the shallow resistivity of the fracture of the sandstone reservoir have a difference in magnitude, the sandstone reservoir has reservoir effectiveness.
5. The multi-information fusion gray sandstone reservoir evaluation method of claim 4, wherein the method for judging that the depth resistivity, the medium resistivity and the shallow resistivity of the cracks of the sandstone reservoir have amplitude differences is as follows: If the difference value between the depth resistivity and the moderate resistivity of the cracks of the sandstone reservoir is greater than a fourth threshold value, and the difference value between the moderate resistivity and the shallow resistivity of the cracks of the sandstone reservoir is greater than a fifth threshold value, the depth resistivity, the moderate resistivity and the shallow resistivity of the cracks of the sandstone reservoir have amplitude differences.
6. The multi-information fusion gray sandstone reservoir evaluation method of claim 5, wherein the method for determining the first oiliness of the sandstone reservoir is: And judging that the sandstone reservoir is oil-free if the rock debris color of the sandstone reservoir is gray or grey white, and judging that the first oil property of the sandstone reservoir is oil-free if the rock debris color of the sandstone reservoir is grey brown, black brown, brown or brown.
7. The multi-information fusion gray sandstone reservoir evaluation method of claim 6, wherein the method for judging the second oiliness of the sandstone reservoir is as follows: and if the sandstone reservoir meets five conditions of the gas measurement value, the second oiliness of the sandstone reservoir is oiliness.
8. The multi-information fusion gray sandstone reservoir evaluation method of claim 7, wherein said five conditions of gas measurements are a first condition, a second condition, a third condition, a fourth condition and a fifth condition, respectively; The first condition is that the ratio of the peak value of the gas-measured total hydrocarbon to the lowest value of the total hydrocarbon of the upper and lower surrounding rocks is more than 3 times; the second condition is that the ratio of ethane to propane is lower than 1.4; When drilling wells to a layer interface of a sandstone reservoir, if the delay time of the occurrence of the gas detection full hydrocarbon peak value is greater than a fourth threshold value, the sandstone reservoir is an oil-bearing layer; the fourth condition is that when C1/C2 is more than or equal to 2 and less than or equal to 10, C1/C3 is more than or equal to 2 and less than or equal to 14, and C1/C4 is more than or equal to 2 and less than or equal to 21, wherein C1 is a methane value, C2 is an ethane value, C3 is a propane value, and C4 is a butane value; The fifth condition is that the humidity ratio is greater than the equilibrium ratio.
9. The multi-information fusion gray sandstone reservoir evaluation method of claim 8, wherein the humidity ratio is: WH=(C2+C3+C4+C5)/(C1+C2+C3+C4+C5); Where WH is the humidity ratio, C1 is the methane number, C2 is the ethane number, C3 is the propane number, C4 is the butane number, and C5 is the pentane number.
10. The multi-information fusion gray sandstone reservoir evaluation method of claim 9, wherein the balance ratio is: BH=(C1+C2)/(C3+C4+C5); Wherein BH is humidity ratio, C1 is methane value, C2 is ethane value, C3 is propane value, C4 is butane value, and C5 is pentane value.

Description

Multi-information fusion grey sandstone reservoir evaluation method Technical Field The invention belongs to the field of petroleum development, and particularly relates to a multi-information fusion gray sandstone reservoir evaluation method. Background The development of the gray sandstone reservoir of a plurality of domestic oilfield sand river street groups has compact lithology and complex pore structure, and the evaluation of the effectiveness of the reservoir and the fluid property is always a difficult problem in the technical field of oilfield development. Although the former establishes a plurality of evaluation methods such as a core analysis method, a plate method and the like, the method has no universality and has low interpretation compliance rate. The conventional method for evaluating the limestone and sandstone reservoirs is mainly based on two aspects, namely, a conventional logging data is utilized to analyze logging response characteristics of different lithology strata, a resistivity and density relation chart is established on the basis and combined with the testing oil data, reservoir fluid properties are identified through the chart, secondly, a two-basin Alternet tuff and sandstone reservoir is taken as a research object, on the basis of analyzing core test data, geological data and logging data of the area and response characteristics thereof, an effective method for calculating the content of the lithology by utilizing a logging curve is further researched, further a physical parameter calculation model based on the content of the lithology is established, in the conventional logging data is utilized to evaluate the effectiveness of the reservoir, the evaluation result is deviated due to consideration of influences of cracks on the effectiveness of the reservoir, the interpretation coincidence rate is reduced, in the conventional logging data is utilized to conduct fluid property identification through establishing the resistivity and lithology relation or the chart, and the measured value of the limestone and the sandstone is often influenced by the conventional logging data on the fact that the measured value of the lithology and the contrast of the reservoir is greatly influenced by the conventional logging data, and the resistivity of the sandstone reservoir is greatly influenced by the fact that the measured value of the contrast of the lithology is greatly influenced by the contrast of the reservoir is greatly influenced by the resistivity of the rock. Therefore, the prior art grey sandstone reservoir evaluation method has the problem of low coincidence rate. Disclosure of Invention In order to solve the above problems in the prior art, namely the problem of lower coincidence rate in the prior art of the limestone-sandstone reservoir evaluation method, the invention provides a multi-information fusion limestone-sandstone reservoir evaluation method, which comprises the following steps: Judging whether the sandstone reservoir has a reservoir forming condition based on whether the sandstone reservoir has a high point of construction, sand development and oil faults; Determining whether the sandstone reservoir has reservoir effectiveness based on whether the matrix void of the sandstone reservoir is greater than a first threshold and whether the depth resistivity, the medium resistivity, the shallow resistivity of the fracture of the sandstone reservoir have an amplitude difference; judging a first oiliness of the sandstone reservoir based on a cuttings color of the sandstone reservoir; judging the second oiliness of the sandstone reservoir based on the magnitude of the gas-measured total hydrocarbon peak ratio, the magnitude of the ethane-to-propane ratio, the gas-measured total hydrocarbon peak time lapse and the gas-measured component ratio, and the derived parameter ratio of the sandstone reservoir; and judging that the sandstone reservoir is oily when the sandstone reservoir has a reservoir forming condition and has reservoir effectiveness, wherein the first oiliness of the sandstone reservoir is oily, and the second oiliness of the sandstone reservoir is oily, otherwise, judging that the sandstone reservoir is non-oily. In a preferred embodiment, the method of determining whether the sandstone reservoir has a reservoir formation condition is: If the difference value of the geological height of the sandstone reservoir and the geological height of the surrounding area is larger than a second threshold value, the sandstone reservoir is provided with a high point; if the scale of the sandstone body of the sandstone reservoir is greater than a third threshold, the sandstone reservoir develops; If the sandstone reservoir has an oil source fault, the sandstone reservoir has an oil source fault; if the sandstone reservoir has high points of construction, sand development and oil source faults at the same time, the sandstone reservoir has a reservoir formation condition. In a pre