Differential overpressure distribution in Ordovician carbonates, Shuntuoguole area, Tarim Basin

被引：0

作者：

Zeng S. ^{[1
,2
]}

Qiu N. ^{[1
,2
]}

Li H. ^{[3
]}

Ma A. ^{[3
]}

Zhu X. ^{[4
]}

Jia J. ^{[1
,5
]}

Zhang M. ^{[1
,2
]}

机构：

[1] National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing

[2] College of Geosciences, China University of Petroleum (Beijing), Beijing

[3] Petroleum Exploration and Production Research Institute, SINOPEC, Beijing

[4] Northwest Oilfield Company, SINOPEC, Ürümqi

[5] Economics and Development Research Institute Company Limited, SINOPEC, Beijing

来源：

Earth Science Frontiers | 2023年 / 30卷 / 06期

关键词：

deep carbonate rock; differential distribution mechanism; origin of overpressure; Shuntuoguole low uplift; strike-slip faults;

D O I：

10.13745/j.esf.sf.2023.2.30

中图分类号：

学科分类号：

摘要：

With the continual advancement in deep exploration in the Tarim Basin, a succession of anomalous high-pressure reservoirs associated with strike-slip faults have been discovered in the ultra-deep carbonate strata of the Shuntuoguole region, but the origin of the overpressure and its distribution pattern have rarely been discussed. Also, the relationship between strike-slip fault and formation pressure in cratons has seldom been studied compared to results for extensional basins and compressive foreland basin systems; whilst strong carbonate reservoir heterogeneity further complicates the overpressure pattern. In this study the characteristics of the present-day pressure field and the main features of overpressure reservoirs are analyzed based on data from drilling tests and production dynamics studies. Further, combined with paleopressure calculation (using fluid inclusions), gas geochemical characteristics and faults activity, the origin of overpressure and its differential distribution in secondary tectonic units of the Shuntuogole area are discussed. The results suggest that the overpressure in the Shunbei slope and Shuntuoguole low uplift is caused by gas charging and tectonic compression, with the former mainly affected by pyrolytic gas generation from crude oil cracking. The gas generation and faults activity determine the differential overpressure distribution, where overpressure occurs widely across the Shunnan area but only locally in the Shunbei and Shuntuoguole areas. The development pattern of the fault-associated reservoirs results in the division of the pressure system in the Shuntuoguole area. © 2023 Science Frontiers editorial department. All rights reserved.

引用

页码：305 / 315

页数：10