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四川盆地长宁、焦石坝志留系龙马溪组页岩气刻度区精细解剖

王玉满，黄金亮，王淑芳，董大忠，张晨晨，管全中   

  1. (中国石油勘探开发研究院，北京 100083)
  • 收稿日期:2015-07-08 修回日期:2016-01-26 出版日期:2016-03-10 发布日期:2016-03-10
  • 作者简介:王玉满（1968-）， 男，湖北荆门人，高级工程师，博士，主要从事沉积储层与非常规油气地质研究. E-mail:wangyuman@petrochina.com.cn.
  • 基金资助:

    国家重点基础研究发展计划（“973”）项目（编号:2013CB228001）；国家页岩气重大专项（编号:2011ZX05018-001）联合资助.

Dissection of two calibrated areas of the Silurian Longmaxi Formation, Changning and Jiaoshiba,Sichuan Basin

Wang Yu-man，Huang Jin-liang，Wang Shu-fang，Dong Da-zhong，Zhang Chen-chen，Guan Quan-zhong   

  1. (Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China)
  • Received:2015-07-08 Revised:2016-01-26 Online:2016-03-10 Published:2016-03-10

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摘要：

长宁和焦石坝气田为2种不同类型的海相页岩气“甜点”区。针对两大刻度区开展了8项关键参数分析，揭示了两大“甜点”区的共性和差异，主要表现为:①2个气田均具有正向构造背景、富有机质页岩厚度大(>30m)、有机质丰度高(平均TOC>3%)、岩相组合有利(硅质页岩和钙质硅质页岩为主)、基质孔隙发育(孔隙度>4%)、气层压力高(压力系数>1.4)、单井产量高(水平井初试产量一般在10×104m3/d以上)等地质特征，但在裂缝发育程度、孔隙类型和地应力方面存在差异;②长宁气田总体为层间缝发育、基质孔隙为主、两向应力差大(>10MPa)的高产气区，开发难度相对较大，在四川盆地承压区具有广泛代表性，可以成为盆地内向斜区和燕山—喜马拉雅期断褶区资源评价类比取值的重要参考对象；③焦石坝气田总体为特殊构造背景下的裂缝型页岩气藏，在四川盆地承压区具有特殊的构造背景、宏观网状缝和裂缝孔隙十分发育、两向地应力小(<10MPa)、资源丰度高、开发难度小、产量高等独特性，其页岩气赋存的基本地质参数可以作为川东局部地区页岩气资源评价的参考对象。研究证实，五峰组—龙马溪组存在基质孔隙+裂缝型和基质孔隙型等2种页岩气藏类型，为页岩气资源评价提供了2种重要的刻度区。

关键词: 长宁, 焦石坝, 龙马溪组, 页岩气, 裂缝孔隙度, 刻度区

Abstract:

Changning and Jiaoshiba gas fields are two different types of marine shale gas “sweet spot”.Based on the analysis of eight key geologic parameters,the commonalities and differences between the two gas fields were uncovered in this paper as follows:(1)The two gas fields share the geologic characteristics including positive structural setting,great thickness of organic-rich shale(>30m),high organic matter abundance(average TOC>3%),favorable lithofacies association(dominated by siliceous shale and calcareous-siliceous shale),well-developed matrix pores(porosity>4%),high gas reservoir pressure(pressure coefficient>1.4),and excellent per well production(initial test production of horizontal well generally exceeds 100 000m3/d).However,they differ in development degree of fractures,pore types,and in-situ stress.(2)Changning gas field,characterized by well-developed interlaminated fractures,dominant matrix pores,and great difference between maximum and minimum horizontal in-situ stress(>10MPa),is a highly productive area with relatively great development difficulty.This gas field is broadly representative of the confined area in the Sichuan Basin,thus providing a significant reference for the resource assessment and analogy in syncline area and Yanshanian-Himalayan folding area within the basin.(3)Jiaoshiba gas field is a fractured shale gas reservoir in general,which features special structural setting,well-developed macro-netted fractures and fracture pores,small difference between maximum and minimum horizontal in-situ stress(<10MPa),great resource abundance,relatively less development difficulty,and high production.The basic geologic parameters of shale gas occurrence in this gas field can be used as a useful reference for the shale gas resource evaluation in some areas of east Sichuan.The study suggested that the Wufeng-Longmaxi shale gas reservoirs are of two distinct types:One with both matrix pores and fractures,and another with only matrix pores,providing two types of important calibrated area for shale gas resource evaluation.

Key words: Changning, Jiaoshiba, Longmaxi Formation, Shale gas, Fracture porosity, Calibrated area

中图分类号: 

  • TE122.1

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