湘鄂西地区下寒武统水井沱组页岩储层分布及非均质性特征

doi:10.3969/j.issn.1672-7703.2018.04.005

摘要/Abstract

摘要： 湘鄂西地区下寒武统水井沱组页岩储层研究程度相对较低，而页岩储层分布的不均一性严重制约了页岩气的勘探。以湘鄂西地区水井沱组页岩为研究对象，结合剖面和钻井资料，通过薄片、矿物含量、有机地球化学、扫描电镜等分析资料，分析了湘鄂西地区水井沱组页岩储层分布和非均质性特征。研究区有利页岩储层发育的相带为深水陆棚，以碳质页岩和硅质页岩为主。水井沱组划分为两个三级层序，Sq1时期以硅质陆棚为主，Sq2时期碳质陆棚分布更广。宏观上海侵体系域主要发育硅质页岩、碳质页岩，为富有机质页岩发育段；高位体系域主要发育钙质泥页岩、粉砂质泥页岩。微观上海侵体系域中页岩储层具有黏土矿物和有机碳含量向上逐渐升高，脆性矿物含量降低的特征，储集空间由基质孔向溶蚀孔、有机质孔演变，总孔隙度向上逐渐变大；高位体系域中页岩储层变化规律则相反。页岩储层分布的非均质性特征可能受到沉积时期海平面升降变化、物源供给以及生物作用的控制，也受到成岩作用、构造作用和水文地质作用的影响。

关键词: 湘鄂西地区, 水井沱组, 页岩储层, 非均质性

Abstract: The study on the shale reservoirs in the Lower Cambrian Shuijingtuo Formation in western Hunan-Hubei region are relatively less, and their heterogeneity severely limits the exploration of the shale gas. Taking the Shuijingtuo Formation shale as a target, and through analysis of thin sections, mineral content, organic geochemistry and SEM on profile and drilling data, the distribution and heterogeneity characteristics of the shale reservoirs in the Shuijingtuo Formation were studied. The result shows that the favorable facies for the development of the shale reservoirs is the deep water shelf, while dominated by carbonaceous shale and siliceous shale in the study area. The Shuijingtuo Formation is divided into two third-order sequences:the Sq1 is dominated by siliceous continental shelves, and the Sq2 is carbonaceous continental shelves more widely distributed. Macroscopically, siliceous and carbonaceous shales are developed in the transgressive system tract, which constitute an organic-rich shale zone; while calcareous and silty mud shales are developed in the highstand system tract. Microscopically, the shale reservoirs in the transgressive system tract have the features of increasing clay minerals and organic carbon content and decreasing brittle mineral content, and the reservoir space evolved from matrix pores to dissolved and organic pores, showing increasing total porosity; the shale reservoirs in the highstand system tract change in the opposite. The heterogeneous distribution of the shale reservoirs may be controlled by changes in sea level, source supply and biological effects, as well as diagenetic, tectonic and hydrogeological effects during the sedimentation.

Key words: western Hunan-Hubei region, Shuijingtuo Formation, shale reservoir, heterogeneity

中图分类号:

胡忠贵, 秦鹏, 胡明毅, 邱小松, 左洺滔. 湘鄂西地区下寒武统水井沱组页岩储层分布及非均质性特征[J]. 中国石油勘探, 2018, 23(4): 39-50.

Hu Zhonggui, Qin Peng, Hu Mingyi, Qiu Xiaosong, ZuoMingtao. The distribution and heterogeneity characteristics of shale reservoirs in Lower Cambrian Shuijingtuo Formation in western Hunan -Hubei region[J]. China Petroleum Exploration, 2018, 23(4): 39-50.

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