塔里木盆地古城地区走滑断裂特征及其对白云岩气藏的控制作用

doi:10.3969/j.issn.1672-7703.2022.04.010

摘要/Abstract

摘要： 塔里木盆地古城地区是非常重要的油气勘探领域，近年来虽多口井在古城地区中西部白云岩发育区获得勘探发现，但天然气藏分布规律仍不明确，制约了下一步勘探部署。以区域应力分析为背景，利用近年来采集的高精度三维连片地震资料，通过构造导向滤波、最正曲率地震属性提取分析等三维刻画成果指导断裂精细解释，结合走滑断裂模拟实验，开展古城地区走滑断裂对白云岩气藏的控制作用研究。结果表明，古城地区发育NEE向、NE向、NNE向、NNW向和NW向5个走向的断裂，分别形成于加里东早期、加里东中期、加里东中期—海西早期、印支期和燕山期—喜马拉雅期5个主要活动时期。其中NE 向、NNE 向两组断裂活动强、数量多，夹角约为40°，组成了空间立体网状断裂体系。由于岩性、岩相和岩溶条件的差别，古城地区中西部白云岩发育区和东部石灰岩发育区，分别发育受构造背景控制的准层状岩性气藏和断溶体独特空间样式的“竖直板状”气藏，需要采取不同的刻画技术、井型等勘探对策，为古城地区效益勘探奠定了基础。

关键词: 塔里木盆地, 古城地区, 白云岩气藏, 走滑断裂, 曲率属性

Abstract: Gucheng area is a major field for petroleum exploration. In recent years, discoveries have been obtained in multiple wells with dolomite developed in the central and western parts of Gucheng area. However, the unclear distribution law of gas reservoirs restricts the exploration deployment in the near future. Based on the analysis of regional stress field, 3D continuous seismic data acquired in recent years are used to finely interpret the faults guided by 3D characterization results such as structural guidance filtering and extraction and analysis of seismic attributes of the most positive curvature. By combining with the simulation experiment, the control effect of strike slip faults on dolomite gas reservoirs in Gucheng area is analyzed. The study result shows that five groups of strike slip faults in NEE, NE, NNE, NNW and NW directions were developed in Gucheng area during the Early Caledonian, Middle Caledonian, Middle Caledonian-Early Hercynian,Indosinian and Yanshanian-Himalayan. Among them, fault groups of NE and NNE trending have intensive activities and large number, with an included angle of about 40°, forming a stereoscopic network fault system in space. Due to the differences in lithologies, lithofacies, and karstification conditions, two types of gas reservoirs are developed in the dolomite deposition area in the central and western parts and the limestone deposition area in the eastern part in Gucheng area, namely the quasi layered lithologic gas reservoir controlled by structural settings and “vertical plate” gas reservoir in fault karst with unique spatial style, which require different exploration strategies such as characterization technologies and well type, laying foundation for the benefit exploration in Gucheng area.

中图分类号:

TE111.2

刘洋, 冯军, 徐伟, 张婷婷, 荆雅莉, 王海学. 塔里木盆地古城地区走滑断裂特征及其对白云岩气藏的控制作用[J]. 中国石油勘探, 2022, 27(4): 135-148.

Liu Yang, Feng Jun, Xu Wei, Zhang Tingting, Jing Yali, Wang Haixue. Characteristics of strike slip faults and their control on dolomite gas reservoirs in Gucheng area, Tarim Basin[J]. China Petroleum Exploration, 2022, 27(4): 135-148.

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