Sedimentary evolution of the Lower Jurassic Sangonghe Formation in Baijiahai uplift, Junggar Basin and its significance in oil and gas exploration

doi:10.3969/j.issn.1672-7703.2018.01.009

Abstract

Abstract: Less systematic studies have been focused on the evolution and distribution of the sedimentary facies in the Sangonghe Formation in the southwest Baijiahai Uplift, the Junggar Basin. To support the oil and gas exploration and development, and understand the evolution of the sedimentary environment, the evolution rule in the Sangonghe Formation was investigated using outcrops, cores, logging and seismic data and based on the analysis of regional sedimentary background and the 3 mid-term datum cycles divided by high resolution sequence stratigraphy. The study suggests two sedimentary facies in the Sangonghe Formation--braided river delta and lacustrine facies; braid-river delta front subfacies are developed in MSC1-MSC2, and shore-shallow lacustrine sediments are mainly in MSC3; and influenced by the fluctuation of the lake level, there are differences in the thickness and distribution of the sandstone reservoirs. The study states that favorable reservoirs of class I and class Ⅱ are distributed in the braided river delta front in MSC1 and MSC2, and favorable reservoirs of class Ⅲ are in the shallow lake sandbar in MSC3.The study on the evolution of the sedimentary environment of the Sangonghe Formation not only enriches the exploration and development achievements of the Jurassic Baijiahai uplift, but also determinesand expands future field of oil and gas explorationin the Junggar Basin.

Key words: Junggar Basin, Baijiahai uplift, Lower Jurassic, Sangonghe Formation, evolution of sedimentary environment

CLC Number:

Jin Jun, Fu Huan, Yu Jingwei, Qi Liqi, Shang Ling, Wen Huaguo, Xu Wenli. Sedimentary evolution of the Lower Jurassic Sangonghe Formation in Baijiahai uplift, Junggar Basin and its significance in oil and gas exploration[J]. China Petroleum Exploration, 2018, 23(1): 81-90.

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