鄂尔多斯盆地东部大面积致密碳酸盐岩气地质特征及成藏条件分析

发布时间：2018-01-11 01:10

本文关键词：鄂尔多斯盆地东部大面积致密碳酸盐岩气地质特征及成藏条件分析　出处：《天然气地球科学》2017年05期 　论文类型：期刊论文

【摘要】：基于非常规气理念,以鄂尔多斯盆地东部奥陶系马家沟组马五_(1+2)亚段碳酸盐岩储层为例,采用露头、岩心、铸体薄片、孔隙度、渗透率、同位素和试气成果资料综合分析的方法,重新认识和评价其含气潜力。结果表明,储层以泥粉晶—粗粉晶白云岩为主,渗透率小于0.1×10~(-3)μm~2的储层占80%以上,孔隙类型主要为裂缝—溶孔、裂缝—晶间孔,非均质性强,属于致密碳酸盐岩储层。气藏具有低丰度大面积分布、异常低压、无边底水、无自然产能、产水少等特点,属于碳酸盐岩致密气藏。天然气分布主要受控于大范围稳定分布的特殊的镶嵌式源储组合和平缓的单斜构造背景,勘探潜力较大,是海相碳酸盐岩天然气勘探的一种新类型。
[Abstract]:Based on the idea of unconventional gas, taking carbonate reservoir of Majiagou formation of Ordovician Majiagou formation in eastern Ordos Basin as an example, outcrop, core, cast thin slice, porosity and permeability are used. Based on the comprehensive analysis of isotopic and gas test data, the gas potential of the reservoir is re-recognized and evaluated. The results show that the reservoir is dominated by mudstone and coarse powdery dolomite. The reservoir with permeability less than 0.1 脳 10 ~ (-3) 渭 m ~ (-2) is more than 80%. The pore types are mainly fracture-dissolved pore, fracture-intergranular pore and strong heterogeneity. The gas reservoir has the characteristics of low abundance and large area distribution, abnormal low pressure, boundless bottom water, no natural productivity and less water production. The distribution of natural gas is mainly controlled by the special inlaid source assemblage and the flat monocline structure background, which is mainly controlled by the stable distribution of natural gas in a large area, and the exploration potential is great. It is a new type of natural gas exploration in marine carbonate rock.
【作者单位】：中国石油长庆油田分公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(编号:2016ZX05044);国家科技重大专项“鄂尔多斯盆地奥陶系—元古界成藏条件研究与区带目标评价”(编号:2016ZX05004006)联合资助
【分类号】：P618.13
【正文快照】： Gas Geoscience,2017,28(5):677-686.[魏新善,陈娟萍,张道锋,等.鄂尔多斯盆地东部大面积致密碳酸盐岩气地质特征及成藏条件分析[J].天然气地球科学,2017,28(5):677-686.]0引言致密气包括致密砂岩、致密碳酸盐岩及其他致密岩类中赋存的天然气。全球具有丰富的致密气资源,已经在

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