深层页岩气勘探开发进展与攻关方向

doi:10.13809/j.cnki.cn32-1825/te.2021.01.001

摘要/Abstract

摘要：

通过对近年来深层页岩气突破井的总结,提出了深层页岩气的4个地质特点：①深、浅层页岩基本评价参数相似,但深层页岩含气量和孔隙度一般都要高于中深层;②深层页岩水平应力差远大于中深层;③盆地内深层页岩气普遍表现为超压,压力系数普遍在1.9~2.1,盆地边缘复杂构造区则表现为常压;④正向构造依然是深层页岩气获得高产的主要因素。根据Haynesville和Barnett页岩气田单井生产曲线递减特征分析和四川盆地深层页岩气地质特点,指出了深层页岩气存在的理论认识创新、工程工艺适用性、成本与效益开发3个主要方面问题及其相应的攻关对策。

关键词: 四川盆地, 深层页岩气, 五峰组—龙马溪组我国页岩气可采资源, 水平应力差

Abstract:

Based on the summary of deep shale gas breakthrough wells in recent years, four geological characteristics of deep shale gas are put forward. First, the basic evaluation parameters of deep and shallow shale are similar, but gas content and porosity of deep shale are generally higher than those of medium-deep shale. Second, the horizontal stress difference of deep shale is much greater than that of medium-deep shale. Third, deep shale gas in the basin is generally overpressured, and the pressure coefficient is generally between 1.9 and 2.1, while the complex structure area at the edge of the basin is normally pressured. Fourth, the positive structure is still the main factor for high yield of deep shale gas. Based on the analysis of the decline characteristics of single well production curve in Haynesville and Barnett shale gas fields and the geological characteristics of deep shale gas in Sichuan Basin, three main problems of deep shale gas, namely theoretical understanding innovation, engineering process applicability as well as cost and benefit development. The corresponding countermeasures are also pointed out.

Key words: Sichuan Basin, deep shale gas, Wufeng-Longmaxi Formation, horizontal stress difference

中图分类号:

TE122

郭彤楼. 深层页岩气勘探开发进展与攻关方向[J]. 油气藏评价与开发, 2021, 11(1): 1-6.

Guo Tonglou. Progress and research direction of deep shale gas exploration and development[J]. Reservoir Evaluation and Development, 2021, 11(1): 1-6.

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参数	深层页岩气（威荣）	中深层页岩气（焦石坝）
埋深（m）	3 500~3 850	2 150~3 300
TOC>2 %的优质页岩厚度（m）	25~35	38~41
孔隙度（%）	6.06	4.87
含气量（m³/t）	6.17	5.20
游离气比例（%）	76~84	56~64
沉积微相	含钙硅质深水陆棚	硅质深水陆棚
硅质含量（%）	36~42	48~69
钙质含量（%）	15~38	10~13
压力系数	1.9~2.1	1.2~1.5
可压裂指数FI	0.38~0.47	0.62~0.68
破裂压力（MPa）	95~113	55~70
水平应力差异系数	0.25	0.11
微裂缝	不发育	发育