An evaluation method for shale gas favorable areas based on geological survey and remote sensing data

Abstract

The present invention provides a shale gas favorable area evaluation method based on geological survey and remote sensing data, which specifically includes: calculating the depositional environment of the target layer, the current burial state of the target layer, and There are seven evaluation indicators of surface fracture density, exposed stratum dip, surface elevation, surface slope and land use; according to the existing exploration practice experience, the establishment of standards divides each index into "favorable", "low risk", and "high risk". Risky" and "unfavorable" four grades, and assign corresponding weights; take the logarithm of the base ten as the logarithm of the weight value of each index to get the comprehensive evaluation index; combined with the measured shale gas-bearing properties, determine the comprehensive evaluation index The risk level is used to delineate the favorable areas for shale gas exploration and development; the beneficial effect of the method provided by the invention is: to carry out convenient, quantitative and comprehensive risk estimation in areas where oil and gas geological data are lacking, and to increase the number of favorable areas for shale gas exploration and development. evaluation efficiency.

Description

technical field [0001] The invention relates to the field of shale gas exploration and development, in particular to a method for evaluating favorable areas of shale gas based on geological survey and remote sensing data. Background technique [0002] There are several sets of marine organic-rich shale developed in the Sinian-Permian strata in southern my country. Their hydrocarbon source quality and reservoir performance can be compared with those of commercially successful shale formations in North America, and their huge resource potential has reached ten percent. It has been confirmed by the exploration and development work in the past years. At present, the delineation of long-term areas has been completed for each main target layer system, and it is entering the stage of evaluation of favorable areas and implementation of target areas. Preliminary studies have shown that the shale series in North America are mostly distributed in a relatively stable structural backgrou...

AI Technical Summary

Problems solved by technology

The joint constraints of geological, engineering, ecological, economic and other factors lead to uncertainty in the distribution of marine shale gas resources, difficult exploration, high risk and cost, low data density, and unsatisfactory commercial results

In the past, the evaluation of favorable areas was limited to the "one-hole view" of a few discrete well points and small-scale geophysical data for post-exploration and summary, or based on a single perspective such as geology and engineering, which is not only not comprehensive enough, but also unable to make effective predictions role, but also ignores the need for environmental protection

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