DEVELOPMENT CHARACTERISTICS OF INHERITED FRACTURES IN DEEP SAND-SHALE RESERVOIR
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摘要:
西部挤压盆地内低渗性含油气砂泥岩储层构造运动期次多、埋藏深度大、泥质夹层多、高角度网状缝继承性发育，裂缝不仅是油气的有效运移通道，也是储层压裂开发效果的主要影响因素。选择西部天山山前某区块深层砂泥岩裂缝性气藏为研究区，以裂缝形成机制的探讨和研究为突破点，在岩心观察、CT层析成像扫描、成像测井解释的基础上，精细统计裂缝产状、开度、充填度，结合流体包裹体及古应力场划分裂缝发育期次，最后总结继承性裂缝的发育模式。研究结果表明，砂泥岩储层裂缝继承性缝的有利发育条件为多期次构造运动、低应力差、低逼近角度、适当泥质含量或低摩擦因数，岩性是内因，构造应力是外因。
Abstract:Aiming at low-permeability sand-shale reservoir in western compressional basin, with multiple tectonic movements, deep layers, many sale interlayers and high angle fracture network, the fractures not only acts as an effective migration pathway for oil and gas, but also are the main influencing factors to reservoir fracturing development. Taking one of given area for the deep sand shale fractured gas reservoirs before western Tianshan mountain, aiming at bottle neck effect in fracture prediction, carrying out formation mechanism study will be the break through, firstly on the base of core observation, CT computed tomographic scans and imaging logging interpretation, the study subtly statistics fracture occurrences, apertures and packing, then combing fluid inclusion testing and palaeostress field to divide formation times and conclude development models. The result shows that favorable conditions for inherited fractures in sand-shale reservoir are multiple tectonic movements, low stress difference, low approaching angle, appropriate shale content, on the whole, tectonic stress is the external factor, but lithology is the internal cause.
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表 1 天山山前某地区不同岩性岩石裂缝分布特征
Table 1. Fractures distribution featuress of different rocks in an area in front of the Tianshan Mountain
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