致密砂岩气藏高产富集规律研究——以川西坳陷新场—合兴场须家河组二段气藏为例

doi:10.13809/j.cnki.cn32-1825/te.2024.04.003

摘要/Abstract

摘要：

四川盆地川西坳陷须家河组致密砂岩气藏储量巨大，具有砂体厚、物性差、非均质性强、气水分布复杂等特点，给气藏的开发评价及建产选区带来极大难度。为实现气藏高效评价开发，以新场—合兴场须家河组二段气藏为研究对象，基于气藏静、动态特征，深度分析了典型井的古、今构造位置，断层特征，裂缝和储层品质等对产能的影响，明确气井高产的主要控制因素。通过分析各控制因素的综合作用，结合成藏研究成果，探讨天然气富集高产规律，结果表明新场—合兴场须家河组二段气藏气井可分为高产高效、中产中效、低产低效3种类型。高产高效和中产中效气井产量高、稳产好，主要分布在北南向四级烃源断层和五级断层附近，裂缝发育、优质储层厚度大，具有良好的地质条件。明确了气藏富集高产遵循古、今构造控藏，烃源断层控富，有效裂缝控产，优质储层控稳的规律，为该气藏的高效开发奠定了基础。

关键词: 川西坳陷, 须家河组, 致密砂岩气藏, 富集高产规律, 新场构造带

Abstract:

The tight sandstone gas reservoirs of the Xujiahe Formation in the western Sichuan Depression of the Sichuan Basin are characterized by thick sand bodies, poor physical properties, strong heterogeneity, and complex gas-water distribution. These factors significantly challenge the development evaluation and productivity zone selection for this gas reservoir. The second member of Xujiahe Formation in Xinchang-Hexingchang gas reservoir has been chosen as the subject of in-depth research to facilitate efficient evaluation and development. The research includes analyzing both static and dynamic characteristics of the gas reservoir, as well as examining the ancient and modern structural positions, fault characteristics, fractures, and reservoir quality of typical wells. These analyses help to identify the main factors controlling high production in gas wells. By considering the comprehensive effects of various controlling factors and integrating the findings from reservoir formation studies, the pattern of natural gas enrichment and high productivity is explored.The results indicate that the gas wells of the second member of Xujiahe Formation gas reservoir in Xinchang-Hexingchang can be categorized into three types: high yield and high efficiency, medium yield and medium efficiency, and low yield and low efficiency. Wells with good geological conditions—those that are high-yield and high-efficiency or medium-yield and medium-efficiency—are found to have high and stable production. They are primarily located near the north to south fourth-level and fifth-level hydrocarbon source faults, where fractures are well-developed and the thickness of high-quality reservoirs is considerable. The enrichment and high productivity of the gas reservoirs are governed by the interplay of several factors: ancient and modern structures that control the reservoirs, hydrocarbon source faults that dictate enrichment, effective fractures that enhance production, and high-quality reservoirs that ensure stability. These insights provide a solid foundation for the efficient development of gas reservoirs in the region.

Key words: western Sichuan Depression, Xujiahe Formation, tight sandstone gas reservoirs, high-yield enrichment law, Xinchang tectonic belt

中图分类号:

TE122

严焕榕,詹泽东,李亚晶,毕有益,邓美洲,冯英. 致密砂岩气藏高产富集规律研究——以川西坳陷新场—合兴场须家河组二段气藏为例[J]. 油气藏评价与开发, 2024, 14(4): 541-548.

YAN Huanrong,ZHAN Zedong,LI Yajing,BI Youyi,DENG Meizhou,FENG Ying. High yield enrichment law for tight sandstone gas reservoir: A case study of the second member of Xujiahe Formation gas reservoir in Xinchang-Hexinchang gas field of western Sichuan Depression[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 541-548.

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气井类别	经济评价内部收益率/%	无阻流量/ （10⁴ m³/d）	稳产期/a	稳产期稳定产量/ （10⁴ m³/d）	平均水气比/ （10⁴ m³/ m³）	平均动态储量 / 10⁸ m³
Ⅰ类	>12	>80	>3	>20	16	7.5
Ⅱ类	8~12	<45	4~6	5~10	6	5.3
Ⅲ类	<8	<20		<5	9	0.5