Characteristics and Genesis of the Gypsum-mold Type Reservoir of the Majiagou Formation in the Sulige Gas Field

doi:10.11885/j.issn.16745086.2019.11.01.02

Abstract

Abstract: Gypsum-mold-bearing micrite dolomite is an important reservoir type in the upper Ordovician Majiagou Formation in the Ordos Basin, and its formation time and genesis are important for the understanding of this reservoir type. In this research, based on the abundant core data of the study area, using the analysis of conventional physical properties and observation methods such as core, thin sections, the characteristics of the reservoir containing "gypsum-mold" and its genesis are comprehensively studied. The results show that the "gypsum-mold" is mainly developed in the micrite dolomite, which is located in the middle part of the shallowing upward sequence, and the two types of non-semi-filled and fully-filled types are often seen. As a reservoir, that mainly develops three kinds of reservoir spaces:residual pores in gypsum mold and interbedded pores in bedrock. The physical property test shows that this reservoir has superior performance, whose average porosity is 5.34%, and the average permeability is 1.02 mD. The dolomitic seepage silt similar to the composition of the bedrock is filled in the "gypsum-molds". The vertical sedimentary sequence shows that the development of the "gypsum-mold" is controlled by sedimentary cycles, the top of the cycles is characteristic of exposure, and the karst system can be seen poured with mud from the next transgression, all indicating that the formation of the "gypsum-mold" is related to the eogenetic karst, that is, the pore is formed in the early diagenetic stage, not the epigenetic stage of traditional understanding.

Key words: gypsum-mold, penecontemporaneous karst, reservoir characteristics, the upper Ordovician Majiagou Formation, the East Sulige Area

CLC Number:

TE122

YU Haojie, ZHONG Shoukang, LI Fuping, XUE Wen, TIAN Qinghua. Characteristics and Genesis of the Gypsum-mold Type Reservoir of the Majiagou Formation in the Sulige Gas Field[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 71-80.

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