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

doi:10.7657/XJPG20230403

Abstract

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

CLC Number:

TE122.21

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.

Figures/Tables 10

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Table 1.

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

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