Sea-land transition phase shale reservoir three-dimensional utilization development evaluation method

Abstract

The invention discloses a sea-land transition phase shale reservoir three-dimensional utilization development evaluation method which comprises the following steps: 1, based on logging data of a target sea-land transition phase shale gas well, calculating rock mechanics parameters, formation weak plane development parameters, reservoir physical property parameters and lithologic interface difference parameters of a single layer, namely an ith layer, of a horizontal well section; 2, calculating single-layer and multi-layer stacked three-dimensional matrix evaluation factors, fracture network evaluation factors and abundance evaluation factors of the horizontal section of the target well; 3, obtaining a three-dimensional'geology-engineering 'comprehensive evaluation index based on the multi-layer stacked three-dimensional matrix evaluation factor, the fracture network evaluation factor and the abundance evaluation factor; and 4, carrying out three-dimensional development evaluation grading on multiple layers of the horizontal sections of the target well, and carrying out three-dimensional production development effect evaluation on different multiple layers of stacked horizontal well sections according to the grade. According to the method, the sea-land transition phase fracturing cost can be remarkably reduced, the construction efficiency is improved, the yield increasing effect is improved, and large-scale efficient development of sea-land transition phase resources is facilitated.

Description

technical field [0001] The invention relates to a three-dimensional producing and developing evaluation method for shale reservoirs of marine-terrestrial transitional facies, and belongs to the technical field of unconventional oil and gas stimulation and transformation. Background technique [0002] my country's marine-terrestrial transitional facies shale gas resources are abundant, and different research institutions in China predict that the resources will reach 2.4-7.4 trillion cubic meters. It is an important exploration replacement field after marine shale gas, and it is a key field of unconventional oil and gas exploration research. my country's marine-terrestrial transitional shale reservoirs are quite different from marine shale reservoirs, and there are also differences in engineering technology. Fracturing development faces a series of problems such as complex geological conditions, high technological requirements, difficult construction, and difficulty in formin...

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Problems solved by technology

[0004] In recent years, the characterization of the reservoir space and the development of natural weak surfaces of shale reservoirs has been insufficient. At present, the identification of sweet spots for shale reservoirs at home and abroad is based on the compressibility represented by a single index of rock brittleness, ignoring the compressibility of rock. Because of the essential relationship between fracture properties and fracture network construction, and without considering the relationship between evaluation factors and gas-bearing properties, and the influence of reservoir heterogeneity caused by vertical lithological changes on the three-dimensional development of reservoirs, the three-dimensional producing Development evaluation is an important basis and premise for efficient fracturing in marine-terrestrial transitional multi-layer stacking

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