Geological Characteristics and Sweet Spot Evaluation of Shale Oil Reservoir in Fengcheng Formation in Well Maye-1

doi:10.7657/XJPG20220609

Abstract

Abstract:

The Fengcheng formation in the Mahu sag is a set of high-quality alkaline lake source rocks dominated by lacustrine dark shale and dolomitic rocks, which contains a large quantity of shale oil resources and is a field with great potential for unconventional hydrocarbon exploration in the Junggar basin. It is necessary to clarify the geological characteristics and evaluate the sweet spots in the Fengcheng formation. Based on the continuous coring data from the Fengcheng formation in Well Maye-1, and by means of core observation, thin section identification, whole rock analysis, rock pyrolysis, kerogen microscopy, and brittleness evaluation, the sedimentary environment, dominant lithology, source rock quality, accumulation performance, natural fractures, brittleness and mobility of each submember of the Fengcheng formation were compared and analyzed. The results show that the fine-grained sedimentary rocks in the Fengcheng formation can be divided into twelve rock types according to mineral composition and bedding structure, and into five kinds of sedimentary assemblage according to sedimentary environment, that is, freshwater, salinity, evaporite, weak salinization and low salinity assemblage, which correspond to five sedimentary submembers of the Fengcheng formation. A set of mature source rocks with moderate abundance of organic matters dominated by type Ⅱ₁ and type Ⅰ kerogens is found in the Feng 3₃ submember. Furthermore, the Feng 3₃ submember contains lamellar diamictite reservoirs with abundant fractures and dissolved pores, favorable physical and oil-bearing properties, high brittleness index, and strong oil and gas mobility. Thus, the Feng 3₃ submember has the favorable conditions of hydrocarbon generation and accumulation for shale oil and should be considered as the focus for subsequent shale oil exploration and development.

Key words: Mahu sag, Well Maye-1, Fengcheng formation, shale oil, sedimentary assemblage, geological characteristic, sweet spot evaluation, source rock

CLC Number:

TE122

ZOU Yang, QI Yanping, SONG Dong, CHEN Wenshun, WEI Panyun. Geological Characteristics and Sweet Spot Evaluation of Shale Oil Reservoir in Fengcheng Formation in Well Maye-1[J]. Xinjiang Petroleum Geology, 2022, 43(6): 714-723.

Figures/Tables 10

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