Lithofacies paleogeography in the deposition period of the fourth member of the Ordovician Majiagou Formation and its reservoir control effect, Ordos Basin

doi:10.3969/j.issn.1672-7703.2022.04.005

Abstract

Abstract: The strategic breakthrough in Well MT 1 indicates promising prospects of the fourth member of Majiagou Formation (Ma 4 Member) in Ordos Basin. However, the lack of understanding on lithofacies paleogeography and reservoir development of Ma 4 Member restricts the further gas exploration and deployment. By integrating geological and geophysical methods, the lithofacies paleogeography restoration of Ma 4 member and its control on reservoir development are analyzed. The study results show that: (1) The paleogeography before the deposition of Ma 4 member had a pattern of “three uplifts and one depression”, i.e., Yimeng Ancient Land, Central Paleo Uplift, Lvliang Uplift, and Intra Platform Depression. Among them, the depression was further divided into two bulges and two sags, namely Yulin-Hengshan Bulge, Shenmu-Mizhi Bulge, Taolimiao Sag and Mizhi Sag. The paleogeographic pattern of alternating uplift and depression and bulge in depression controlled the distribution of favorable reservoir development zone of Ma 4 member; (2) Three fourth-order cycles were developed in the deposition period of Ma 4 member, including the third, second, and first submembers of Ma 4 member (i.e., Ma 4₃, Ma 4₂ and Ma 4₁) from bottom to top. Ma 4₃ submember was dominated by transgression cycle, in which the Central Uplift evolved into a weakly rimmed platform margin and the eastern basin presented a semi-restricted platform, with the main deposits of limestone and dolomitic limestone. Ma 4₂ submember was developed in the early-stage regression. With the accretion of platform marginal beach and the fall of sea level, the barrier effect of platform margin was prominent. The eastern basin was characterized by the restricted platform environment, and thin layers of dolomite and gypsum rocks of mound beach facies were deposited in bulge areas. Ma 4₁ submember was mainly deposited in the middle stage of regression. The barrier effect of the platform margin enhanced, and water depth in the restricted platform in the eastern basin continued to be shallower.The mound beach was dominated in bulge areas, with a larger thickness and wider distribution range of dolomite and gypsum rock; (3) The lithofacies paleogeography controlled the type and distribution of Ma 4 member reservoir, with the grain dolomite, microbial dolomite and porphyritic (limy) dolomite reservoirs developed. Controlled by the grain (mound) beach microfacies, the grain dolomite and microbial dolomite reservoirs were developed at the paleo uplift and bulge area. While the porphyritic (limy) dolomite reservoir was mainly developed in lagoon environments. In conclusion, Yulin-Hengshan and Shenmu-Mizhi bulges are favorable areas for reservoir development and gas exploration practice.

CLC Number:

TE122

Zhou Jingao, Zhang Tao , Yu Zhou, Wu Dongxu, Li Chengshan, Ding Zhenchun, Li Weiling, Liu Yuxin, Yin Chen. Lithofacies paleogeography in the deposition period of the fourth member of the Ordovician Majiagou Formation and its reservoir control effect, Ordos Basin[J]. China Petroleum Exploration, 2022, 27(4): 61-74.

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