Caprock characteristics and sealing evaluation of Pingbei gentle slope belt in Xihu Sag

GUAN Yunwen; ZHOU Feng; PU Renhai; FAN Changyu

doi:10.16028/j.1009-2722.2021.258

2022 Vol. 38, No. 10

Article Contents

Article navigation > Marine Geology Frontiers > 2022 > 38(10): 34-41

Next Article Previous Article

GUAN Yunwen, ZHOU Feng, PU Renhai, FAN Changyu. Caprock characteristics and sealing evaluation of Pingbei gentle slope belt in Xihu Sag[J]. Marine Geology Frontiers, 2022, 38(10): 34-41. doi: 10.16028/j.1009-2722.2021.258

Citation:

GUAN Yunwen, ZHOU Feng, PU Renhai, FAN Changyu. Caprock characteristics and sealing evaluation of Pingbei gentle slope belt in Xihu Sag[J]. Marine Geology Frontiers, 2022, 38(10): 34-41. doi: 10.16028/j.1009-2722.2021.258

Caprock characteristics and sealing evaluation of Pingbei gentle slope belt in Xihu Sag

1.
Department of Geology, Northwest University, Xi'an 710069, China
2.
SINOPEC Shanghai Offshore Oil and Gas Company, Shanghai 200120, China

More Information

Corresponding author: PU Renhai, perenhai@126.com

Received Date: 30 September 2021

Accepted Date: 22 August 2022

Publish Date: 28 October 2022

Abstract

Abstract

Caprock is one of the main reservoir-controlling factors of the Pingbei gentle slope belt (PGSB) in the Pinghu structural belt of the Xihu Sag. To find out the distribution law of high-quality caprocks and its role in reservoir control in the PGSB, 3D seismic data covering an area of 1200 km² and 23 exploratory wells in the PGSB were analyzed by well-constrained seismic inversion technology, and the development of the caprock in PGSB was analyzed. Results show that there is a set of regional mudstone caprock S1 on average porosity of 1.5% in the upper Pinghu section of the PGS, thus most of the oil and gas generated from the source rocks of the Pinghu Formation could be retained in the Pinghu Formation. The time window of the upper and lower 50 ms of the T₃¹ interface was selected to produce the time thickness map of the S1 caprock, which objectively showed the overall appearance and distribution characteristics of the caprock, and pointed out that the poor local sealability caused missing of the caprock in wells of L1, T2, W4, B2, etc.. Meanwhile, considering the influence of faults on the sealability of the caprock, it was pointed out that when mud smear factor was less than 1.8, it had good sealability for oil and gas. Overall consideration of caprock thickness, shale content, faults, and other factors, the sealability of the S1 caprock in the PSG belt could be classified and evaluated for providing guidance to oil and gas exploration in the area in future.
- regional caprock /
- distribution law /
- three-dimensional seismology /
- mudstone smear factor /
- Pingbei gentle slope belt /
- Xihu Sag

FullText(HTML)

References

[1]	童晓光,牛嘉玉. 区域盖层在油气聚集中的作用[J]. 石油勘探与开发,1989,16(4):1-8. doi: 10.3321/j.issn:1000-0747.1989.04.002 CrossRef Google Scholar
[2]	周雁,金之钧,朱东亚,等. 油气盖层研究现状与认识进展[J]. 石油实验地质,2012,34(3):234-245. doi: 10.3969/j.issn.1001-6112.2012.03.002 CrossRef Google Scholar
[3]	吕延防,付广,于丹. 中国大中型气田盖层封盖能力综合评价及其对成藏的贡献[J]. 石油与天然气地质,2005,26(6):742-745. doi: 10.3321/j.issn:0253-9985.2005.06.007 CrossRef Google Scholar
[4]	付晓飞,吴桐,吕延防,等. 油气藏盖层封闭性研究现状及未来发展趋势[J]. 石油与天然气地质,2018,39(3):454-471. doi: 10.11743/ogg20180304 CrossRef Google Scholar
[5]	张正涛,林畅松,李慧勇,等. 渤海西部海域新生代盖层特征及对油气的控制作用[J]. 地质力学学报,2019,25(3):357-369. doi: 10.12090/j.issn.1006-6616.2019.25.03.033 CrossRef Google Scholar
[6]	胡芬,叶加仁,刘俊海. 东海西湖凹陷平湖构造带油气运聚特征[J]. 海洋地质与第四纪地质,2003,23(1):95-102. Google Scholar
[7]	李敏,陈永进,姜文斌. 西湖凹陷平湖组岩性油气藏形成条件[J]. 油气地质与采收率,2012,19(2):23-25. doi: 10.3969/j.issn.1009-9603.2012.02.007 CrossRef Google Scholar
[8]	王存武,赵志刚,张功成,等. 东海西湖凹陷盖层条件及对油气藏的控制作用[J]. 海洋石油,2013,33(2):22-27. doi: 10.3969/j.issn.1008-2336.2013.02.022 CrossRef Google Scholar
[9]	王伟,张丽艳,李响. 平湖油气田油气成藏新模式[J]. 海相油气地质,2011,16(1):51-55. doi: 10.3969/j.issn.1672-9854.2011.01.007 CrossRef Google Scholar
[10]	张宙,王勇刚,唐贤君. 东海陆架盆地西湖凹陷油气分布特征及成藏规律[J]. 长江大学学报(自然科学版),2020,17(1):9-15. Google Scholar
[11]	杨鹏程,刘峰,沈珊,等. 西湖凹陷平北地区平湖组煤系烃源岩生烃潜力研究[J]. 海洋地质与第四纪地质,2020,40(4):139-147. Google Scholar
[12]	秦兰芝,谢晶晶,张武. 西湖凹陷平北区平湖组储层主控因素分析[J]. 长江大学学报(自科版),2017,14(19):13-18. doi: 10.3969/j.issn.1673-1409.2017.19.004 CrossRef Google Scholar
[13]	杨慧,刘广景,蒋俊,等. 西湖凹陷平北地区平湖组储层特征及主控因素研究[J]. 石油化工应用,2015,34(11):77-82. doi: 10.3969/j.issn.1673-5285.2015.11.021 CrossRef Google Scholar
[14]	陶瑞明. 东海西湖凹陷天然气成藏条件及分布规律[J]. 天然气工业,1996,16(5):10-15. Google Scholar
[15]	唐贤君,蒋一鸣,张建培,等. 东海盆地西湖凹陷平北区断陷层断裂特征及其对圈闭的控制[J]. 海洋地质前沿,2019,35(8):34-43. Google Scholar
[16]	张建培,徐发,钟韬,等. 东海陆架盆地西湖凹陷平湖组-花港组层序地层模式及沉积演化[J]. 海洋地质与第四纪地质,2012,32(1):35-41. Google Scholar
[17]	罗晶. 不同运移方向下断盖配置对油气运移作用的差异性[J]. 大庆石油地质与开发,2019,38(4):31-37. doi: 10.19597/J.ISSN.1000-3754.201809034 CrossRef Google Scholar
[18]	李键. 断层封堵性分析及SGR方法在东海勘探区应用[J]. 上海国土资源,2014,35(3):95-99. doi: 10.3969/j.issn.2095-1329.2014.03.023 CrossRef Google Scholar
[19]	邵卓娜. 断层封堵能力评价方法分析[J]. 中国石油和化工标准与质量,2014,34(6):215. doi: 10.3969/j.issn.1673-4076.2014.06.201 CrossRef Google Scholar
[20]	BOUVIER J D,KAARS-SIJPESTEIJN C H,KLUESNER D F,et al. Three dimension seismic interpretation and fault sealing investigations[J]. AAPG Bulletin,1989,73:1397-1414. Google Scholar
[21]	LINDSAY N G,MURPHY F C,WALSH J J,et al. Outcrop studies of shale smearon fault surfaces[J]. International Association of Sedimentologists Special Publication,1993,15(1):113-123. Google Scholar
[22]	YIELDING G,FREEMAN B,NEEDHAM T. Quantitative fault seal prediction[J]. AAPG Bulletin,1997,81:897-917. Google Scholar
[23]	江东辉,蒲仁海,苏思羽,等. 断陷盆地斜坡带大型油气田成藏条件:西湖凹陷平北缓坡断裂与岩性控藏有利区[J]. 天然气工业,2021,41(11):33-42. doi: 10.3787/j.issn.1000-0976.2021.11.004 CrossRef Google Scholar