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四川盆地须家河组致密气藏天然气 富集高产成因
Origin of gas accumulation and high yield in tight gas reservoirs of Xujiahe Formation, Sichuan Basin
赵正望 李 楠 刘 敏 王小娟 吴长江 李 莉
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作者单位:中国石油西南油气田分公司勘探开发研究院
中文关键字:致密砂岩 气藏 天然气 富集高产 须家河组 上三叠统 四川盆地 川中地区
英文关键字:Tight sandstone; Gas reservoir; Natural gas; accumulation and high yield; Late Triassic; Sichuan Basin; Central Sichuan Basin
中文摘要:四川盆地经过10 余年致密砂岩气勘探, 效果显著,但储量动用率低、开发效果欠佳,“如何效益勘探开发”已成为致密砂岩气藏的核心问题,开展富集高产因素研究迫在眉睫。为此,通过对四川盆地中部上三叠统须家河组二段高产气井的解剖,从沉积环境、储层、烃源、构造及成藏等基本地质特征入手分析了富气区高产主控因素。研究认为:①须二段天然气富集高产主要受古、今构造、裂缝、优质储层及烃源5 大因素控制;②高产气井总体上分布在古隆起区和裂缝相对发育区,主要发育于构造圈闭或鼻凸上,但在不同区域其影响因素具有差异性,在隆起带,优质储层对形成高产气井的贡献相对较强,而在斜坡带,烃源的贡献作用更为明显;③川中地区须二段主要表现为“3 种成藏模式、2 类油气高产富集模式”,川中东部的合川地区主要为相对优质储层控藏模式、川中西部的三台地区则为顶部薄储与下覆巨厚的烃源组合模式,川中中部的遂宁地区为过渡成藏组合,前者富集高产模式表现为构造- 优质储层模式,后两者则为储渗体模式。
英文摘要:After over a decade of exploration in Sichuan Basin, some achievements on tight sandstone gas are remarkable. However,its reserve producing rate is low, resulting in a poor development effect. So, how to realize an efficient exploration and development is now the core issue for tight sandstone gas reservoirs, and it’s in urgent necessary to investigate factors related to accumulation and high yield. In this study, taking some high-yield gas wells in the Upper Triassic Xujiahe 2 Member of central Sichuan Basin as examples, the main factors controlling accumulation and high yield were investigated based on sedimentary environment, reservoir, source rock, structure, and reservoir-forming conditions. Results show that (1) gas accumulation and high yield in Xujiahe 2 Member is mainly controlled by 5 factors, i.e., palaeo-structure, current structure, fracture, high-quality reservoir, and source rock; (2) high-yield gas wells are generally distributed in palaeo-uplift zone and other areas with relatively developed fractures, which are mainly developed at structural traps and nose arches. However, different areas have their own influential factors, for example in uplifts, high-quality reservoirs contribute more to high-yield gas wells, while in slopes, the contribution of source rock is more; (3) Xujiahe 2 Member in central basin mainly represents "3 reservoir-forming patterns and 2 hydrocarbon accumulation and high yield models", such as, the high-quality reservoir controlling pattern in Hechuan area in the east of central basin, the combination pattern of top thin reservoir with underlying thick source rock in Santai area in the west of central basin, and the transitional reservoir-forming pattern in Suining area in the central part of central basin. The high-yield model of the first pattern is one association of both structure and quality reservoir, and that of the rest two patterns is reservoir permeability system.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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