川南地区五峰组—龙马溪组页岩层序地层及其对储层的控制

doi:10.7623/syxb201508003

石油学报 ›› 2015, Vol. 36 ›› Issue (8): 915-925.DOI: 10.7623/syxb201508003

川南地区五峰组—龙马溪组页岩层序地层及其对储层的控制

王同¹, 杨克明², 熊亮², 史洪亮², 张全林², 魏力民², 何显莉²

1. 成都理工大学能源学院四川成都 610059;
2. 中国石油化工股份有限公司西南油气分公司四川成都 610016

出版日期:2015-08-25 发布日期:2015-08-06
作者简介:王同,男,1987年7月生,2010年获武汉生物工程学院学士学位,2013年获成都理工大学硕士学位,现为成都理工大学石油与天然气地质学专业博士研究生,主要从事非常规油气地质方面的研究工作。Email:mrmenzu@aliyun.com
基金资助:
国家重大科技专项(2011ZX-05002-004)和中国石油化工股份有限公司油田事业部非常规重大导向项目"四川盆地及周缘页岩气整体评价与目标优选"(13KT-14)资助。

Shale sequence stratigraphy of Wufeng-Longmaxi Formation in southern Sichuan and their control on reservoirs

Wang Tong¹, Yang Keming², Xiong Liang², Shi Hongliang², Zhang Quanlin², Wei Limin², He Xianli²

1. College of Energy Resources, Chengdu University of Technology, Sichuan Chengdu 610059, China;
2. Sinopec Southwest Oil & Gas Company, Sichuan Chengdu 610016, China

Online:2015-08-25 Published:2015-08-06

摘要/Abstract

摘要：

随着四川盆地勘探程度的深入,页岩气藏已经成为勘探重点,有必要系统地开展页岩层序地层研究。在岩石地层、生物地层、年代地层研究的基础上,运用露头-钻井-地震、全球海平面变化曲线、地球化学、古生物等资料,在川南地区五峰组—龙马溪组页岩地层中识别出4个三级层序界面,划分了3个三级层序:SQ1相当于五峰组,沉积速率低(1.18~2.19 m/Ma);SQ2相当于龙马溪组下段及上段底部,沉积速率较低(约为15 m/Ma);SQ3相当于龙马溪组上段中上部,沉积速率较高(216.25~340 m/Ma)。建立了该区的层序地层格架。分析了层序对储层的控制作用,主要体现在黑色页岩层序SQ1—SQ2中相对海平面升降与页岩脆性指数呈负相关、与TOC及孔隙度呈正相关,渗透率高值多位于脆性段,渗透率低值多位于塑性段。灰色页岩层序SQ3以塑性段为主,孔、渗均低于SQ1、SQ2凝缩段,其相对海平面与有机质没有明显的相关性。相对海平面变化影响了优质页岩储层发育,SQ1、SQ2海侵期—海退早期为优质页岩储层发育期。综合本次研究成果,明确了层序地层对优质页岩储层的控制作用,对于在层序格架内预测优质页岩储层段具有指导意义。

关键词: 页岩, 五峰组, 上奥陶统, 龙马溪组, 下志留统, 层序地层

Abstract:

With the deepening exploration in Sichuan Basin, shale gas reservoirs have become the key point of exploration. It is necessary to systematically study shale sequence stratigraphy. On the basis of research on lithostratigraphy, biostratigraphy and chronostratigraphy, outcrop-well-seismic data, global sea level change curve, geochemistry, paleontology and other information are used to identify four third-order sequence boundaries. A total of three third-order sequences are divided, i.e., SQ1 equivalent to Wufeng Formation with very low deposition rate (1.18-2.19 m/Ma), SQ2 equivalent to the lower member of Longmaxi Formation and the bottom of the upper member with low deposition rate (about 15 m/Ma), and SQ3 equivalent to the central-upper member of Longmaxi Formation with high deposition rate (216.25-340 m/Ma). Moreover, a sequence stratigraphic framework of this region was established. Meanwhile, the control function of sequence on reservoirs was analyzed, and mainly reflected as the negative correlation between relative sea-level change and brittle index, positive correlation to total organic carbon and porosity in the black shale sequence (SQ1-SQ2), and high values of permeability mainly distributed in brittle members while low values in ductile members. The gray shale sequence (SQ3) is dominated by ductile members, where the porosity and permeability are lower than SQ1 and SQ2 condensed section, while no significant correlation exists between relative sea level and total organic carbon. Relative sea level changes have effects on the development of high-quality shale reservoirs. SQ1 and SQ2 transgression-early regression was the development period of high-quality shale reservoirs. In combination with research results in this study, the control function of sequence stratigraphy on high-quality shale reservoirs has been clarified, which will provide a guidance for prediction of the high-quality shale reservoir members in the sequence framework.

Key words: shale, Wufeng Formation, Upper Ordovician, Longmaxi Formation, Lower Silurian, sequence stratigraphy

中图分类号:

TE122.3

王同, 杨克明, 熊亮, 史洪亮, 张全林, 魏力民, 何显莉. 川南地区五峰组—龙马溪组页岩层序地层及其对储层的控制[J]. 石油学报, 2015, 36(8): 915-925.

Wang Tong, Yang Keming, Xiong Liang, Shi Hongliang, Zhang Quanlin, Wei Limin, He Xianli. Shale sequence stratigraphy of Wufeng-Longmaxi Formation in southern Sichuan and their control on reservoirs[J]. Acta Petrolei Sinica, 2015, 36(8): 915-925.

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川南地区五峰组—龙马溪组页岩层序地层及其对储层的控制

Shale sequence stratigraphy of Wufeng-Longmaxi Formation in southern Sichuan and their control on reservoirs

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