Oil-Bearing Properties and Hydrocarbon Occurrence States of Fengcheng Formation Shale in Well Maye-1，Mahu Sag

doi:10.7657/XJPG20220607

Abstract

Abstract:

The oil-bearing properties and hydrocarbon occurrence states of shale are crucial to evaluating and selecting shale oil sweet spots. Through the analysis such as rock pyrolysis, multi-temperature-gradient pyrolysis and X-ray diffraction, the oil-bearing properties and hydrocarbon occurrence states of the shale in the Lower Permian Fengcheng formation in Well Maye-1, Mahu Sag, were investigated, and then the optimal sweet spot intervals for shale oil in the Fengcheng formation were defined. The results show that the Fengcheng formation shale in Mahu sag is mainly composed of three lithofacies associations. The quality of source rocks is the best in the Feng 2 member, partially moderate in the Feng 1 member, and poor in the Feng 3 member. The macerals of organic matter in the rocks are mainly vitrinite and inertinite, indicative of a mature stage, showing a good material basis for shale oil accumulation. Vertically, the Fengcheng formation shale can be divided into 6 sweet spot intervals with good oil-bearing properties. The lamellar felsic shale intervals at the top and in the middle of the Feng 2 member have the best oil-bearing property, and contain hydrocarbons mainly in free state, where free oil accounts for more than 80% of the total oil content and mainly occurs in intergranular pores and bedding fractures continuously, suggesting a good oil-bearing foundation and a good prospect of movable resource. The research results provide a theoretical basis and technical support for subsequent exploration and development of the shale oil in the Fengcheng formation

Key words: Junggar basin, Mahu sag, Well Maye-1, Fengcheng formation, shale oil, oil-bearing property, hydrocarbon occurrence state

CLC Number:

TE122.23

QIAN Menhui, WANG Xulong, LI Maowen, LI Zhiming, LENG Junying, SUN Zhongliang. Oil-Bearing Properties and Hydrocarbon Occurrence States of Fengcheng Formation Shale in Well Maye-1，Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 693-703.

Figures/Tables 12

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