Geological characteristics and exploration countermeasures of shale gas in the Shanxi Formation of the Ordos basin

被引：0

作者：

Liu H. ^{[1
,2
,3
]}

Wang H. ^{[4
]}

Zhang H. ^{[4
]}

Zhao W. ^{[4
]}

Liu Y. ^{[4
]}

Liu D. ^{[1
,2
,3
]}

机构：

[1] Research Institute Petroleum Exp. & Dev., Petrochina, Beijing

[2] PetroChina Key Laboratory for Unconventional Oil and Gas, Beijing

[3] National Energy Shale Gas Research and Development (Experiment) Center, Langfang, 065007, Hebei

[4] Exploration and Development Research Institute, Changqing Oilfield, Petrochina, Xi'an

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2020年 / 94卷 / 03期

关键词：

Ordos basin; Organic matter nanopore; Shale gas; Shanxi Formation;

D O I：

10.19762/j.cnki.dizhixuebao.2020139

中图分类号：

学科分类号：

摘要：

Shale gas resources of the transitional facies account for about one-third of the total amount in China, and have broad prospects for exploration and development. A breakthrough in exploration and development has not been achieved despite the large thickness and wide distribution of the transitional facies in the Ordos basin. This study aims to determine differences in the geological characteristics between the transitional and marine shale gas reservoirs and their reservoir-forming principles by analyzing the total carbon content, vitrinite reflectance, mineral composition, micropore texture and gas content in the eastern Ordos basin. The comparative study of shale gas generation, storage and accumulation processes between transitional and marine shale gas reservoirs shows that the shale reservoir formation process of Shanxi Formation has its particularity. Its kerogen belongs to type III originating from higher plants, with little liquid hydrocarbon production, which is bubble pore formation process with a small amount of organic nanopore. Interbeds of sand-mud-coal in the formation mean that the source rock has a high efficiency of hydrocarbon expulsion, resulting in low content in the shale. The shale gas accumulation process of the Shanxi Formation is quite different from that of the marine shale gas because of its high expulsion efficiency and influence on shale gas content. After generation within the Shanxi Formation shale, a lot of gas has migrated to the overlying or underlying tight sandstones. The tight sandstones, coals and shale reservoirs resemble a sandwich. It is predicted that the southeast of the study area is a favorable area. When exploring the shale gas in Shanxi Formation, the "gas bearing zone" of coal series should be comprehensively considered, which means favorable shale gas-rich zones should be investigated together with tight sandstones and coals using three-dimensional exploration strategy for commercial production. © 2020, Science Press. All right reserved.

引用

页码：905 / 915

页数：10

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