Strike-slip fault control on karst in ultra-deep carbonates, Tarim Basin, China

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

AAPG Bulletin Pub Date : 2024-02-01 DOI:10.1306/09212321161

Lianbo Zeng, Jinxiong Shi, Qingyou Ma, Wenya Lyu, Shaoqun Dong, Dongsheng Cao, Hehua Wei

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引用次数: 0

Abstract

Karst reservoirs in the Ordovician carbonates of Tarim Basin are currently major targets of deep and ultra-deep hydrocarbon exploration and development in China. New drilling and seismic data show that these deep-buried carbonate karst reservoirs are spatially dependent on strike-slip faulting. Based on the geological and geophysical data, this study developed an attempt to determine the impact and spatial distribution of strike-slip faulting on carbonate karst reservoirs in the Tahe oil field. Strike-slip faults in the Taha area can be classified as first order, second order, and third order. Fault damage zones are distributed along the strike-slip faults, and their widths have a positive correlation with fault order. Influenced by strike-slip faults, fault-related fractures, and rock mechanical properties, the development degree and spatial distribution of carbonate karst reservoirs display strong heterogeneity. The horizontal heterogeneity of karst reservoirs is controlled by strike-slip faults with different scales and strikes, and the vertical heterogeneity is combined results of the strike-slip faulting and mechanical properties of carbonates. In the Tahe area, ultra-deep carbonate karst reservoirs are generally concentrated within 550 m (∼1800 ft) of the damage zone of north-northeast– and north-northwest–striking first-order and second-order strike-slip faults. Fewer and smaller-scale karst reservoirs are developed further away from the fault core. Additionally, fracture intensity is greater in more brittle facies enhancing the karstification. The results from this research provide an analogue for understanding the distribution of fault-controlled karsting in deep carbonate reservoirs around the world.

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中国塔里木盆地超深碳酸盐岩岩溶的走向滑动断层控制

塔里木盆地奥陶系碳酸盐岩岩溶储层是中国目前深层和超深层油气勘探开发的主要目标。新的钻探和地震资料表明，这些深埋碳酸盐岩岩溶储层在空间上依赖于走向滑动断层。本研究以地质和地球物理资料为基础，试图确定走向滑动断层对塔河油田碳酸盐岩喀斯特储层的影响和空间分布。塔河地区的走向滑动断层可分为一阶、二阶和三阶。断层破坏带沿走向滑动断层分布，其宽度与断层阶数呈正相关。受走向滑动断层、与断层有关的断裂和岩石力学性质的影响，碳酸盐岩岩溶储层的发育程度和空间分布具有很强的异质性。岩溶储层的水平异质性受不同规模和走向的走向滑动断层控制，垂直异质性是走向滑动断层和碳酸盐岩力学性质的综合结果。在塔河地区，超深碳酸盐岩岩溶储层一般集中在北北东向和北北西向一阶和二阶走向的走向滑动断层破坏带的 550 米（∼1800 英尺）范围内。远离断层核心区的岩溶储层数量较少，规模较小。此外，在脆性较大的岩层中，断裂强度较大，从而加剧了岩溶化。这项研究的结果为了解全球深层碳酸盐岩储层中受断层控制的岩溶分布提供了类比。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AAPG Bulletin 工程技术-地球科学综合

CiteScore

6.60

自引率

11.40%

发文量

审稿时长

4.8 months

期刊介绍： While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.