CN-121995471-A - Sedimentary diagenetic seismic and geological combined prediction method

CN121995471ACN 121995471 ACN121995471 ACN 121995471ACN-121995471-A

Abstract

The invention provides a sedimentary facies seismic and geological combined prediction method which comprises the steps of determining reservoir parameters and reservoir facies types corresponding to reservoir rock core sheets, determining pore structure types of various facies, classifying sedimentary facies, dividing the sedimentary facies into facies and sub-facies, establishing a linear multi-element discriminant function of the sedimentary facies, determining distribution characteristics of the sedimentary facies on a single well, calculating petrophysical elastic parameters of various wells, screening sensitive elastic parameters capable of distinguishing the facies and the sub-facies, and determining a spatial distribution range of the facies and the sub-facies. Lays a foundation for the application of the sedimentary diagenetic distribution characteristics in oil and gas exploration.

Inventors

ZHANG TIANJIAO
ZHANG YUNTAO
YU JINGQIANG
XU YUANGANG
DENG ZHENFENG
YANG SHUXIA
WANG LI

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (11)

1. A sedimentary facies seismic geologic combination prediction method, the prediction method comprising: Step S1, determining reservoir parameters and reservoir diagenetic phase types corresponding to reservoir core sheets; step S2, determining pore structure types of various lithofacies; step S3, classifying the facies deposited into facies deposited with advantages and facies deposited with secondary advantages; s4, establishing a linear multi-element discriminant function deposited into lithofacies; s5, defining distribution characteristics of lithofacies deposited on a single well; Step S6, calculating petrophysical elastic parameters of various wells; step S7, screening sensitive elastic parameters capable of distinguishing facies formed by favorable deposition and facies formed by less favorable deposition; and S8, determining the space distribution range of the facies formed by the favorable sedimentary facies and the space distribution range of the facies formed by the second favorable sedimentary facies.
2. The method for combined prediction of sedimentary facies seismogeology according to claim 1, wherein the step S1 of determining the reservoir parameters and the reservoir facies types corresponding to the reservoir core sheet specifically comprises: analyzing the core slices of the various sedimentary facies bands and the various lithofacies reservoirs using a polarizing microscope; observing the formation type of the reservoir in the sheet, and determining reservoir parameters corresponding to the reservoir sheet; And determining the formation type of the reservoir corresponding to the sheet.
3. The method of claim 2, wherein the reservoir parameters include apparent compaction rate, apparent cementing rate, and apparent erosion rate.
4. The method for combined prediction of sedimentary facies and seismic geology according to claim 1, wherein the step S2 of determining pore structure types of the plurality of types of lithofacies specifically comprises: and respectively carrying out mercury injection test and nuclear magnetic resonance test on various lithofacies samples to determine pore structure types of various lithofacies.
5. The method for seismic geologic combination prediction of sedimentary facies according to claim 1, wherein said step S3 comprises classifying the sedimentary facies into favorable sedimentary facies and less favorable sedimentary facies comprising: research on deposition characteristics and diagenetic effect characteristics; Based on core observation, logging data and logging data, designating a sedimentary facies as SDF according to sedimentary facies, lithofacies, pore structures and lithofacies characteristics; And classifying the sedimentary facies into facies which are favorable to be sedimentary and facies which are favorable to be sedimentary by combining physical property, pore throat and nuclear magnetic characteristic analysis.
6. The method for combined prediction of sedimentary facies and seismic geology according to claim 1, wherein the step S4 of establishing a linear multi-discriminant function of sedimentary facies specifically comprises: according to the principle of core scale logging, establishing a relation between logging response and sedimentary lithofacies; And performing Fisher discriminant analysis on the type of the sedimentary facies, and establishing a linear multi-element discriminant function of the sedimentary facies.
7. The method for combined prediction of sedimentary facies and seismic geology according to claim 1, wherein the step S5 is characterized by specifically comprising the following steps: programming according to the discriminant function, writing a quantitative dividing program of a sedimentary facies, and forming a sedimentary facies logging identification program; single well batch prediction is carried out on the sedimentary diagenetic facies; the distribution characteristics of lithofacies deposited on a single well are clear.
8. The method for combined prediction of sedimentary facies seismogeology according to claim 1, wherein said step S6 comprises the steps of: Selecting a drilling well with an actually measured transverse wave speed VS, predicting the transverse wave speed VS' by using an Xu-White method, and performing quality control on the predicted transverse wave speed; and calculating the petrophysical elastic parameters of each well.
9. The method of claim 8, wherein the petrophysical elastic parameters include elastic parameter curve longitudinal wave impedance AI, transverse wave impedance SI, longitudinal-transverse wave velocity ratio VP/VS, lame constant Lambda, shear modulus K, bulk modulus Mu and Young's modulus E.
10. The method for combined prediction of sedimentary facies seismogeology according to claim 1, wherein said step S7 of screening sensitive elastic parameters capable of distinguishing between favorable sedimentary facies and less favorable sedimentary facies comprises: carrying out histogram and intersection analysis on various parameters and sedimentary diagenetic facies; Screening can distinguish between facies and secondary facies of favorable depositions sensitive elastic parameters of facies are advantageously deposited.
11. The sedimentary facies seismic geologic combination prediction method of claim 1, wherein said determining the spatial distribution of facies and sub-facies of sedimentary facies comprises: inversion is carried out on sensitive elastic parameters by using pre-stack waveform indication inversion; the favorable sedimentary facies and the less favorable sedimentary facies are determined.

Description

Sedimentary diagenetic seismic and geological combined prediction method Technical Field The invention relates to the fields of geophysics and petroleum geology, in particular to a sedimentary diagenetic phase earthquake and geology combined prediction method. Background Sedimentary lithofacies are defined as a physical manifestation reflecting the diagenetic environment, i.e., the sum of petrophysical, geochemical and petrophysical features reflecting the diagenetic environment. With the continuous deep research of reservoirs, the concept of lithofacies deposition is more and more widely accepted and used by geological researchers at home and abroad. Although the expression of the term of the sedimentary lithofacies does not completely achieve unified consensus at present, most of the terms relate to the contents of the lithofacies action, the lithofacies minerals and the like, but the formation mechanism, the control factors and the distribution range characteristics of various sedimentary lithofacies are complex and various, and no unified and clear knowledge exists so far. Because of different points of interest, research areas and purposes, students at home and abroad have no unified standard for dividing sedimentary lithofacies, but most of them are divided and named according to diagenetic minerals, diagenetic environments, diagenetic types, diagenetic strengths and pore-penetration characteristics. The geophysical characterization of the sedimentary lithofacies is currently mainly based on well logging data with high vertical resolution and good continuity. Shan Jingzong up sedimentary lithofacies characterization is to build a sedimentary lithofacies standard section by systematic analysis of sedimentary facies, diagenetic effects and strengths, diagenetic evolution sequences, etc. of key wells, and dividing out sedimentary lithofacies types. The core data has the advantages of being comprehensive, direct, objective, high in resolution and the like, so that the sedimentary facies can be finely divided, but the defects of relatively high cost and low data space coverage rate of the core exist, and challenges are provided for the research and subsequent application of the longitudinal and transverse spreading rule of the sedimentary facies. In contrast, the logging and earthquake data have the advantages of higher space coverage rate, more common data, relatively lower cost and the like, so that the core analysis data can be used for calibrating logging and earthquake, and carrying out earthquake geological combined prediction of sedimentary facies space distribution, so that the defect of space resolution of a geophysical method can be overcome, the space coverage rate of sedimentary facies research can be enlarged, and the method can be finally and effectively applied to reservoir geological evaluation. Therefore, aiming at the distribution range characteristics of the sedimentary diagenetic facies, the seismic and geological combined evaluation is used as a precondition of the research method so as to provide scientific guidance for guiding the oil and gas exploration for the distribution characteristics of the sedimentary diagenetic facies in the research area. Disclosure of Invention In view of the above, the present invention has been made to provide a sedimentary diagenetic seismic geology joint prediction method that overcomes or at least partially solves the above-mentioned problems. According to one aspect of the present invention, there is provided a method of depositional lithofacies seismogeological joint prediction, the prediction method comprising: Step S1, determining reservoir parameters and reservoir diagenetic phase types corresponding to reservoir core sheets; step S2, determining pore structure types of various lithofacies; step S3, classifying the facies deposited into facies deposited with advantages and facies deposited with secondary advantages; s4, establishing a linear multi-element discriminant function deposited into lithofacies; s5, defining distribution characteristics of lithofacies deposited on a single well; Step S6, calculating petrophysical elastic parameters of various wells; step S7, screening sensitive elastic parameters capable of distinguishing facies formed by favorable deposition and facies formed by less favorable deposition; and S8, determining the space distribution range of the facies formed by the favorable sedimentary facies and the space distribution range of the facies formed by the second favorable sedimentary facies. Optionally, the step S1 of determining the reservoir parameters and the reservoir diagenetic phase types corresponding to the reservoir core sheet specifically comprises the following steps: analyzing the core slices of the various sedimentary facies bands and the various lithofacies reservoirs using a polarizing microscope; observing the formation type of the reservoir in the sheet, and determining reservoir parameters corresponding t