鄂尔多斯盆地伊陕斜坡太原组碳酸盐岩气藏富集规律

doi:10.7657/XJPG20230501

摘要/Abstract

摘要：

为明确鄂尔多斯盆地伊陕斜坡二叠系太原组碳酸盐岩气藏的分布规律，以钻井、测井、录井、试气等资料为基础，通过野外露头、岩心、岩石薄片、电镜扫描、高压压汞、包裹体测温等分析，对太原组碳酸盐岩气藏储集层的沉积微相、岩石学特征、物性特征、孔隙结构、裂缝分布等进行对比剖析。结果表明：太原组碳酸盐岩气藏为低孔低渗岩性气藏，有利储集层控制气藏的分布和天然气富集，气藏主要分布于生物丘和生屑滩沉积微相发育区；生物丘分布于研究区东部佳县、子洲及清涧一带，生屑滩分布于研究区西部横山、靖边及坪桥一带，自西向东相带分布明显；太原组碳酸盐岩发育泥晶生屑石灰岩和藻粘结石灰岩，生物体腔孔、晶间孔、溶孔和微裂隙为有利储集空间；裂缝是油气运移的良好通道，其发育对气藏富集起积极作用。

关键词: 鄂尔多斯盆地, 伊陕斜坡, 二叠系, 太原组, 碳酸盐岩, 气藏, 天然气, 富集规律

Abstract:

To determine the distribution of the carbonate gas reservoirs in Permian Taiyuan formation in Yishaan slope of the Ordos basin, based on the data of drilling, well testing, logging, and formation testing, the carbonate gas reservoirs in Taiyuan formation were analyzed using field outcrops, core samples, thin sections, electron microscopy scanning, high-pressure mercury intrusion, and fluid inclusion temperature measurements, and then sedimentary microfacies, petrographic characteristics, physical properties, pore structures, and fracture distribution were studied of the reservoir. The results indicate that the carbonate gas reservoirs in Taiyuan formation are low-porosity and low-permeability lithological gas reservoirs. Favorable plays control the reservoir distribution and gas enrichment. The gas reservoirs `are mainly distributed in the bioherm and bioclastic shoal microfacies zones. Bioherms are found in the eastern part of the study area, including Jiaxian, Zizhou, and Qingjian, while bioclastic shoals are developed in the western part of the study area, including Hengshan, Jingbian, and Pingqiao, exhibiting an obvious zoning of facies from west to east. The carbonate rocks in Taiyuan formation consist of micritic bioclastic limestone and algal-bounded limestone, in which biogenic pores, intercrystalline pores, dissolution pores, and microcracks serve as accommondation. Fractures play a crucial role in migration of oil and gas, and their development contributes significantly to the natural gas enrichment in the reservoirs.

Key words: Ordos basin, Yishaan slope, Permian, Taiyuan formation, carbonate, gas reservoir, natural gas, natural gas, enrichment

中图分类号:

TE122.1

李妍蓉, 李靖, 苏文杰, 石磊, 孙睿, 朱玉双. 鄂尔多斯盆地伊陕斜坡太原组碳酸盐岩气藏富集规律[J]. 新疆石油地质, 2023, 44(5): 509-516.

LI Yanrong, LI Jing, SU Wenjie, SHI Lei, SUN Rui, ZHU Yushuang. Natural Gas Enrichment in Carbonate Gas Reservoirs of Taiyuan Formation in Yishaan Slope，Ordos Basin[J]. Xinjiang Petroleum Geology, 2023, 44(5): 509-516.

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