Overpressure in moderately deep to deep strata in the Lengjia-Leijia area，western Liaohe Depression，Bohai Bay Basin：Origin and effects on hydrocarbon accumulation

被引：0
|
作者：
Chen C. [1 ,2 ]
Qiu N. [1 ]
Gao R. [2 ]
Zhou X. [2 ]
Sun Y. [3 ]
Yang L. [4 ]
Fu J. [4 ]
机构：
[1] College of Geosciences, China University of Petroleum（Beijing）, Beijing
[2] Research Institute of Exploration and Development, Liaohe Oilfield Company, PetroChina, Liaoning, Panjin
[3] School of petroleum engineering, Chongqing University of Science & Technology, Chongqing
[4] School of Earth Sciences, Northeast Petroleum University, Heilongjiang, Daqing
来源：
Oil and Gas Geology | 2024年 / 45卷 / 01期
关键词：
accumulation mode; genetic mechanism; Lengjia-Leijia area; Liaohe Depression; moderately deep to deep strata; overpressure;
D O I：
10.11743/ogg20240109
中图分类号：
学科分类号：
摘要：
The moderately deep to deep strata in the Lengjia-Leijia area，western Liaohe Depression exhibit significant overpressure. It’s of great significance to understanding its genetic mechanism and its effects on hydrocarbon migration and accumulation in terms of hydrocarbon exploration therein. Based on measured formation pressure and temperature，log data，and structural analysis，we comprehensively investigate the characteristics and genetic mechanisms of overpressure in these strata and explore its role in hydrocarbon accumulation therein. The results indicate that the Lengjia-Leijia area is characterized by composite thermo-pressure system of the overpressure，normal-pressure，and underpressure types，with the overpressure interval predominantly found in the 3rd and 4th members of the Shahejie Formation（also referred to as the Sha 3 Member and the Sha 4 Member，respectively）within the sub-sag zone，at depths ranging from 2 500 to 4 000 m approximately. The overpressure in the area primarily results from undercompaction，followed by a combination of hydrocarbon generation-induced pressurization，diagenesis，and tectonic compression. There exist two major hydrocarbon migration and accumulation modes in the study area：the self-sourced indigenous mode within overpressure zones and the cross-pressure mode from an overpressure zone to a normal-pressure/underpressure zone. The former is predominantly found within the overpressure zones of the Sha 3 and 4 members in the sub-sag zone. In contrast，the latter occurred during the period of faulting，including overpressure-driven hydrocarbon charging into the Leijia and Gaosheng structural zones from source rocks in the Sha 4 Member in the Chenjia sub-sag，and hydrocarbon accumulation in the eastern steep slope area and Xinglongtai buried hill in the Lengjia area after transporting through faults and sand bodies from the overpressure zones in the lower to middle sub-members of the Sha 3 Member. © 2024 Editorial Department of Oil and Gas Geology. All rights reserved.
引用
收藏
页码：130 / 141
页数：11
相关论文
共 44 条
  • [1] HOU Yandong, Forming conditions of the third section of sandstone reservoir in Chenjia Depression［J］, Fault-Block Oil and Gas Field, 8, 4, pp. 1-3, (2001)
  • [2] Zhe GAO, Study on reservoir-forming regularity in Lengjiapu area ［J］, Heilongjiang Science and Technology Information, 32, (2015)
  • [3] FENG Chong, YAO Aiguo, WANG Jianfu, Et al., Abnormal pressure distribution and formation mechanism in Mahu Sag，Junggar Basin［J］, Xinjiang Petroleum Geology, 35, 6, pp. 640-645, (2014)
  • [4] IMIN Ablimit, TANG Yong, CAO Jian, Et al., Accumulation mechanism and enrichment rules of the continuous hydrocarbon plays in the Lower Triassic Baikouquan Formation of the Mahu Sag，Junggar Basin［J］, Natural Gas Geoscience, 27, 2, pp. 241-250, (2016)
  • [5] ZHI Dongming, Discovery and hydrocarbon accumulation mechanism of quasi-continuous high-efficiency reservoirs of Baikouquan Formation in Mahu Sag，Junggar Basin［J］, Xinjiang Petroleum Geology, 37, 4, pp. 373-382, (2016)
  • [6] Zhi LI, FANG Chaoliang, WEI Lichun, Formation models for oil and gas reservoirs with abnormal high pressure in eastern sag of Liaohe Basin［J］, China Petroleum Exploration, 7, 3, pp. 20-24, (2002)
  • [7] Yuanlin MENG, Lei ZHANG, Guohui QU, Et al., Diagenetic characteristics under abnormally low pressure：A case from the Paleogene of southern Western Sag，Liaohe Depression，Bohai Bay Basin［J］, Petroleum Exploration and Development, 43, 4, pp. 731-736, (2016)
  • [8] JIAO Jinhe, Diagenesis of abnormal pressure in the southern fault block of Liao He Xi Bu Depression［D］, (2013)
  • [9] ZHANG Zhanwen, CHENG Min, CHEN Yongcheng, Feature and blocking capability of formation fluid geopressured system about Liaohe Basin［J］, Fault-Block Oil and Gas Field, 6, 1, pp. 13-16, (1999)
  • [10] LI Yi, FANG Shi, SUN Pingchang, Et al., Geological conditions of shale gas accumulation of Paleogene Shahejie Formation in the western sag of Liaohe Basin［J］, Geology and Resources, 26, 2, pp. 140-146, (2017)
12345