Natural gas source and accumulation model of Mesozoic buried hill in the eastern deep water area of Qiongdongnan Basin

被引：0

作者：

Yang X. ^{[1
]}

Zhou J. ^{[1
]}

Yang J. ^{[1
]}

He X. ^{[1
]}

Wu H. ^{[1
]}

Gan J. ^{[1
]}

You J. ^{[1
]}

机构：

[1] Zhanjiang Branch, CNOOC China Limited, Zhanjiang

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2021年 / 42卷 / 03期

关键词：

Accumulation model; Deep water area; Granite buried hill; Qiongdongnan Basin; Songnan low-uplift;

D O I：

10.7623/syxb202103002

中图分类号：

学科分类号：

摘要：

The granite buried hill area in the eastern deep water area of Qiongdongnan Basin has achieved major exploration breakthroughs, showing good exploration prospects. Based on geochemical analysis, using the latest drilling cores, logging, and seismic data, this paper analyzes the source of gas, key reservoir-forming conditions and the reservoir-forming model of buried hill in the Y8 block of Songnan low-uplift. The results show that the characteristics of carbon isotopes of gas, carbon isotopes of and biomarkers of gas condensate in the Y8 block are similar to those of gas and associated gas condensate in Songnan sag in the eastern deep water area, and quite different from those of L17 gas field and L18 gas field in Lingshui sag in the western deep water area. It reveals that the input of terrestrial organic matter in source rocks in the eastern deep water area is relatively more dominant and the gas in the Y8 block was mainly generated from Songnan sag. The basement of Songnan low-uplift is Indosinian granite, which is controlled by structure, lithology, weathering and leaching, and hydrothermal solution, forming the fracture-type and weathering-dissolution-type buried hill reservoirs and the nose structure ridge with a fishbone pattern. Fracture zones and deep faults in the basement constitute high-speed channels for oil and gas migration. The massive development of faults and fractures increases the contact area between source rocks and reservoirs. Due to the large source rocks-reservoirs pressure difference between the hydrocarbon generation center and the uplift area, the lateral relay-style long-distance migration of gas is from north to south, from the sag to the uplift area. The Y1 block near the sag on the Songnan low-uplift has great potential. The Mesozoic granite buried hill of the Songnan low-uplift is expected to become the next 100 billion cubic meter-level gas accumulation area in Qiongdongnan Basin. © 2021, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：283 / 292

页数：9

共 33 条

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