鄂尔多斯盆地大牛地气田马五5亚段储集层特征及成因

doi:10.7657/XJPG20230403

摘要/Abstract

摘要：

鄂尔多斯盆地马家沟组风化壳之下发育一套孔洞型岩溶储集层，是古生界特大型气田的主力储集层，其中，马五₅亚段底部见一套裂缝发育的喀斯特扰动相储集层，分布稳定且普遍含气，成因尚不清楚，制约了油气勘探与开发。通过对野外露头和岩心等资料的分析，剖析了该亚段储集层的成因。马五₅亚段发育扰动相，发育大量裂缝，野外露头特征明显，成像测井上显示线—斑状模式，裂缝大多被2期方解石充填;扰动相发育在马五₅亚段底部，分布于研究区中西部断裂发育区，气测异常明显，勘探前景良好;$马五^{1}_{6}$小层断裂发育，促进了侧向淡水的强烈岩溶作用，形成可容纳空间，上覆地层压力使马五₅亚段底部脆性石灰岩形成扰动相储集层。

关键词: 鄂尔多斯盆地, 大牛地气田, 马家沟组, 马五段, 喀斯特, 扰动相, 储集层

Abstract:

A set of vug-type karst reservoirs is developed below the weathering crust of the Majiagou formation in the Daniudi gas field of Ordos basin, which are the main reservoirs of the Paleozoic super-large gas fields. The disturbed-facies karst reservoirs with fractures are found stably at the bottom of the fifth submember of the fifth member of Majiagou formation (M5₅) and contain gas universally. The genesis of these reservoirs remains unknown, leading to difficulties in oil and gas exploration and development. Based on the analysis on field outcrop and core data, the genesis of the M5₅ reservoirs was analyzed. Disturbed facies and well-developed fractures are clearly observed from the outcrops, and show a line-porphyritic pattern on the image logging. Most of the fractures are filled by calcite of two periods. The disturbed facies found at the bottom of M5₅ are mainly distributed in the fault zones of the central and western parts of the study area, with obvious gas logging anomalies and good exploration prospects. Abundant fractures in $\text{M5}^{1}_{6}$ promote the strong karstification of fresh water laterally, forming accommodation spaces. The overburden pressure makes the brittle limestone at the bottom of M5₅ evolve to disturbed reservoir.

Key words: Ordos basin, Daniudi gas field, Majiagou formation, M5 member, karst, disturbed facies, reservoir

中图分类号:

TE122.21

高景云, 丁晓琪, 祁壮壮, 田胤瑜. 鄂尔多斯盆地大牛地气田马五₅亚段储集层特征及成因[J]. 新疆石油地质, 2023, 44(4): 404-410.

GAO Jingyun, DING Xiaoqi, QI Zhuangzhuang, TIAN Yinyu. Characteristics and Genesis of M5₅ Reservoirs in Daniudi Gas Field, Ordos Basin[J]. Xinjiang Petroleum Geology, 2023, 44(4): 404-410.

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鄂尔多斯盆地大牛地气田马五₅亚段储集层特征及成因

Characteristics and Genesis of M5₅ Reservoirs in Daniudi Gas Field, Ordos Basin

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