川西坳陷须五段储层微观孔隙结构特征及其控制因素

发布时间：2018-06-10 20:48

本文选题：川西坳陷 + 须五段　；参考：《中国石油勘探》2017年04期

【摘要】：非常规气藏储层的微观孔隙结构是影响气藏储集性能和开发效果的重要因素。以须五段砂岩、泥岩储层为研究对象,综合应用扫描电镜、低温氮气吸附法、激光扫描共聚焦显微镜以及微米—纳米CT扫描等技术手段,对川西坳陷须五段储层微观孔隙结构展开深入研究。研究结果表明:(1)须五段砂岩孔隙类型主要有溶蚀孔、晶间孔、微裂缝,溶蚀孔最为发育;泥质岩孔隙类型有矿物基质孔(粒间孔、粒内孔、晶间孔)、有机质孔、微裂缝,粒间孔、晶间孔最为发育。(2)须五段储层孔隙结构复杂,以中孔、大孔为主,多呈广体细颈型和平板狭长缝型,其比表面积介于1.44~11.7m~2/g之间,平均孔径介于5.75~15.6nm之间,砂岩比表面积比泥岩小,但孔径反而较大。(3)考虑到研究区非常规气藏储层的复杂性,单一技术手段表征孔隙结构都存在片面性,那么有机整合多种现代高精度技术手段进行非常规气藏储层微观孔隙分析显得尤为重要。在此基础上,分析了须五段非常规气藏储层微观孔隙结构的控制因素及产能与不同类型孔隙的关系,为后续"甜点"预测提供地质依据。
[Abstract]:The micropore structure of unconventional gas reservoir is an important factor affecting reservoir performance and development effect. Taking the sandstone and mudstone reservoir of Xuwu formation as the research object, the scanning electron microscope (SEM), low temperature nitrogen adsorption method, laser scanning confocal microscope and micron-nanometer CT scanning were used. The microscopic pore structure of Xuwu member reservoir in western Sichuan depression is studied. The results show that the pore types of the five member sandstones are mainly composed of dissolution pore, intergranular pore, microfracture and dissolution pore, and the pore types of argillaceous rock are mineral matrix pore (intergranular pore, intragranular pore, intergranular pore, organic pore, microfracture), and the pore type of mudstone is mainly composed of mineral matrix pore (intergranular pore, intragranular pore, intergranular pore, organic pore, microfracture). The intergranular pore, intergranular pore is the most developed. The pore structure of the five-member reservoir is complex. The pore structure is mainly mesopore and macropore. The pore structure is mostly broad-body fine neck type and flat plate slit type. Its specific surface area is between 1.44~11.7m~2/g, and the average pore size is between 5.75~15.6nm. The specific surface area of sandstone is smaller than that of mudstone, but the pore size is larger. So it is very important to integrate many modern high-precision techniques to analyze the micro-porosity of unconventional gas reservoir. On this basis, the controlling factors of reservoir micropore structure and the relationship between productivity and different types of pores in the reservoir of Xuwu unconventional gas reservoir are analyzed, which provides the geological basis for the prediction of "dessert".
【作者单位】：中国石化西南油气分公司勘探开发研究院;中国石化西南油气分公司开发管理部;中国地质大学(北京)能源学院;西南石油大学资源与环境学院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05048004)
【分类号】：P618.13

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