Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan

doi:10.7623/syxb201204003

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (4): 551-561.DOI: 10.7623/syxb201204003

• Petroleum Exploration • Previous Articles Next Articles

Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan

WANG Yuman 1　DONG Dazhong 1　LI Jianzhong 1　WANG Shejiao 1　LI Xinjing 1　WANG Li 1,2　CHENG Keming 1　HUANG Jinliang 1

Received:2011-12-16 Revised:2012-03-22 Online:2012-07-25 Published:2012-08-01

川南下志留统龙马溪组页岩气储层特征

王玉满 1　董大忠 1　李建忠 1　王社教 1　李新景 1　王　黎 1,2　程克明 1　黄金亮 1

1　中国石油勘探开发研究院　北京　100083；　2　中国地质大学能源学院　北京　100083

通讯作者: 王玉满
作者简介:王玉满，男，1968年7月生，1991年毕业于江汉石油学院物探系，2004年获中国地质大学（北京）博士学位，现为中国石油勘探开发研究院高级工程师，主要从事沉积储层与非常规油气地质研究工作。
基金资助:
国家重大科技专项(2011ZX05018-001)和中国石油非常规油气资源勘探开发技术研究项目(2011A-4801)资助。

Abstract

Abstract:

Based on the analysis of single-well reservoir geology and integrated with other data of previous research results, drillings and outcrops, we characterized the black-shale reservoir in the lower Longmaxi Formation of the Lower Silurian in southern Sichuan by delineating its depositional environments, black-shale distributions, mineral compositions, reservoir pore types, conservation-permeability conditions, and mechanical properties. It is initially confirmed that the Longmaxi black shale is similar to the main producing gas shale in the United States in terms of four significant reservoir features. ①Black shale is a deep-water shelf-facies deposit with great thickness and widely stable distribution in southern Sichuan and its adjacence, therein organic-rich shale intervals have a high gamma log response and are generally 20~135 m thick in the depocenter area. ②The total content of three brittle minerals, i.e. quartz, feldspar and carbonate, amounts to over 40% and clay minerals contain no montmorillonite and kaolinite. The formations are generally rigid, brittle and characterized by relatively high elastic modulus and low Poisson’s ratio.③There exist four kinds of matrix pores, including residual primary pores, organic pores, interlayer micropores in clay minerals and dissolution pores in unstable minerals, as well as a large amount of fractures. Of which organic micropores and interlayer micropore in clay minerals are the main constituents of shale matrix pores. ④Geophysics, re-examination of previous data and laboratory analyses were used to initially confirm that the Lomgmaxi shale as a gas reservoir is characteristic of an abnormal high pressure and physical properties better than anticipation. In summary, the Longmaxi Formation black shale in southern Sichuan is of good reservoir conditions for shale-gas exploration and production.

Key words: Longmaxi Formation, shale gas, organic-rich shale, organic pore, abnormal high pressure

摘要：

以单井储层地质分析为基础，结合其他钻井、露头资料和前人研究成果，从黑色页岩沉积环境与分布、岩矿组成、储集空间类型、储渗条件、力学性质等方面，对川南下志留统龙马溪组下段黑色页岩的储层特征进行了研究。初步证实该页岩储集条件与美国主力产气页岩相近，具有4项显著特征：①黑色页岩为深水陆棚相沉积，厚度大，分布稳定，广泛分布于川南及其邻区，沉积中心区厚度一般为20~135 m，其中富有机质页岩段具高伽马测井响应；②石英、长石、碳酸盐3种脆性矿物含量超过40%，黏土矿物不含蒙脱石和高岭石，具较高弹性模量和较低泊松比，质地硬而脆；③发育残余原生孔隙、有机质孔隙、黏土矿物层间微孔隙、不稳定矿物溶蚀孔等4种基质孔隙以及大量裂缝，其中有机质微孔隙和黏土矿物层间微孔隙是页岩基质孔隙的主要组成部分；④应用地球物理、老资料复查和实验室分析等手段初步证实，川南龙马溪组页岩存在异常高压特征，物性好于预期。总体认为，川南龙马溪组黑色页岩具备页岩气勘探开发的良好储集条件。

关键词: 龙马溪组, 页岩气, 富有机质页岩, 有机质孔隙, 异常高压

WANG Yuman　DONG Dazhong　LI Jianzhong　WANG Shejiao　LI Xinjing　WANG Li. Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(4): 551-561.

王玉满　董大忠　李建忠　王社教　李新景　王　黎　程克明　黄金亮. 川南下志留统龙马溪组页岩气储层特征[J]. 石油学报, 2012, 33(4): 551-561.

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Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan

川南下志留统龙马溪组页岩气储层特征

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