Fan Controlled Large-area Accumulation Conditions and Mode of Upper Wuerhe Formation in MH1 Well Zone of Mahu Sag

doi:10.3969/j.issn.1006-6535.2021.01.006

Abstract

Abstract: the Permian System Upper Wuerhe Formation of Mahu Sag is a large continuous conglomerate oil and gas reservoir group found after the Triassic System Baikouquan Formation. Based on the geological, geophysical and analytical data and regional structural background and sedimentary environment, the paper comprehensively analyzes the oil and gas accumulation conditions and control factors of Upper Wuerhe Formation in MH1 Well Zone from 4 aspects, i.e., hydrocarbon source supply, reservoir cap association, migration pathway and preservation condition. Research shows that the glutenite oil reservoir of Upper Wuerhe Formation in MH1 Well Zone has 4 advantages for continuous accumulation: ① The hydrocarbon source rocks of the Fengcheng Formation of Permian System are characterized by high organic matter abundance, high hydrocarbon generation potential and double peak oil generation, which provide high-quality and efficient hydrocarbon source conditions for the Upper Wuerhe Formation Oil Reservoir in MH1 Well Zone; ② The mud-on-sand deposition mode of the Upper Wuerhe Formation retrogradation-type fan body forms a large and effective reservoir cap association vertically; ③ The ternary composite system of faults, surface of unconformity and permeable sand bodies forms a good three-dimensional conducting network; ④ Subfacies dense zone on fan delta plain, lacustrine facies, inter-fan mudstone and faults are mutually distributed, forming a compound multifaceted shielding, which provides well matched preservation conditions for the accumulation in large areas in the front edge of fan delta. We hereby established the fan controlled large-area accumulation model in MH1 Well Zone and carried out integrated deployment of exploration and development with sizable reserves obtained. This research is of guiding significance for the oil and gas exploration of next stage.

Key words: Mahu sag, MH1 well area, Upper Wuerhe Formation, continuous reservoir, reservoir forming conditions, reservoir forming model

CLC Number:

TE122.2

Lu Honggang, Luo Huanhong, Luo Feifei, Mao Dengzhou. Fan Controlled Large-area Accumulation Conditions and Mode of Upper Wuerhe Formation in MH1 Well Zone of Mahu Sag[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 42-50.

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