库车前陆冲断带多尺度裂缝成因及其储集意义

发布时间：2018-02-11 09:44

  本文关键词： 深层储集层 致密砂岩 天然裂缝 成因类型 形成序列 库车前陆冲断带　出处：《石油勘探与开发》2017年03期 　论文类型：期刊论文

【摘要】：以库车前陆冲断带深层白垩系巴什基奇克组砂岩储集层为例,利用地表露头、岩心、薄片和成像测井等资料,运用工业CT、激光共聚焦、阴极发光、电子探针、扫描电镜等技术手段,基于裂缝开度大小对裂缝进行分级分类,系统研究库车前陆冲断带砂岩储集层天然裂缝类型、特征、成因、期次及形成序列等,并分析不同尺度天然裂缝的储集意义。库车前陆冲断带深层致密砂岩储集层天然裂缝可分为4级:百微米级以上宏观构造裂缝(Ⅰ级)切割单砂体,形成优势运移通道,提高储集层渗透率;十微米级—百微米级微细构造伴生缝(Ⅱ级)切割基质颗粒,连通基质大孔隙,改善渗流性能;微米级粒缘显微成岩缝(Ⅲ级)连通中小孔隙,改善孔隙连通网络,提高天然气运移充注效率;纳米级基质裂隙(Ⅳ级)沟通粒内微孔隙,扩大储集空间,增加储量规模。Ⅰ级与Ⅱ级构造成因裂缝主要发育有3期,其中早期和中期裂缝主要为半充填—充填,是油气大规模充注前的上新世早期以前形成,晚期开启裂缝与油气大规模充注同期或略晚,形成于上新世末期之后。裂缝网络对孔隙度贡献率较低,但在平行裂缝走向上,裂缝可以提高渗透率2~3个数量级。
[Abstract]:Taking the deep Cretaceous sandstone reservoir of Bashiqike formation in Kuqa Foreland thrust belt as an example, using the data of surface outcrop, core, thin slice and imaging logging, using industrial CTs, laser confocal, cathodoluminescence, electron probe, etc. By means of scanning electron microscope and other technical means, the fractures are classified and classified on the basis of fracture opening, and the types, characteristics, origin, stages and formation sequences of natural fractures in sandstone reservoir of Kuqa Foreland thrust belt are systematically studied. The natural fractures in the deep tight sandstone reservoir of Kuqa Foreland thrust belt can be divided into 4 levels: the macroscopic structural fractures (class I) of more than 100 micron size cut the single sand body and form the dominant migration channel. Increasing reservoir permeability; cutting matrix particles with 10 micron to 100 micron microstructures associated fractures (class 鈪，

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