A quantitative characterization method for shale microfacies classification

Abstract

The present invention relates to a quantitative characterization method for shale micro-phase classification. The method is characterized by comprising: in the same shale oil-gas exploration and development block, selecting different shale development micro-blocks to form a sample collection test network, testing the collected shale samples in the micro-blocks, acquiring the related index data, and carrying out analysis treatment to obtain the each micro-block average content reflecting the shale deposition characteristic and environmental parameters; and according to the contents of various evaluation indexes in each micro-block, carrying out quantitative discrimination and evaluation on the shale deposition environment of each micro-block so as to carry out quantitative characterization and system naming on the shale micro-phase in the each micro-block to obtain the shale micro-phase types and the plane distribution characteristic of the shale oil-gas exploration and development block. According to the present invention, the quantitative indexes reflecting the typical parameters of the shale deposition characteristic and the environment are adopted to accurately understand the basic characteristics of different shale micro-phases in the same sub-phase and the difference so as to provide characteristics of improvement of prediction accuracy on the favorable block, improvement of the exploration and development success rate, and reduction of the exploration and development cost.

Description

Technical field: [0001] The invention relates to a quantitative characterization method for shale microfacies classification, which belongs to the technical field of shale oil and gas exploration, development and design. Background technique: [0002] Shale (Shale) is a kind of sedimentary rock with complex composition, but all have thin-sheet or thin-layered joints, mainly formed by clay deposition through pressure and temperature, but mixed with quartz and feldspar debris and other chemicals. Shale gas mainly exists in mud and shale source rocks in the state of adsorption and dissociation. Three factors control the enrichment degree of shale gas reservoirs: shale thickness, organic matter content, and shale reservoir space (pores, fractures). These three factors are all related to the microenvironment of shale deposition. The amount has a certain causal relationship with its depositional microenvironment, and different depositional microenvironments determine whether sha...

AI Technical Summary

Problems solved by technology

These classifications are too coarse, which is not conducive to the scheme design and operation of the oil and gas exploration and development process, resulting in lower exploration and development efficiency and lower success rate, because the exploration and development results are displayed in the same subfacies environment, and the degree of enrichment of shale oil and gas There are obvious differences. For example, the daily gas production of the Pengye 1 well in the Pengshui block is more than 40,000 cubic meters, while the daily gas production of the Jiaoshiba Jiaoye 1 well in the Fuling block is more than 200,000 cubic meters.