Gas Generation Potential of Fengcheng Formation Source Rocks and Exploration Fields in Junggar Basin

doi:10.7657/XJPG20220605

Abstract

Abstract:

In the Junggar basin，where the percent of proved gas reserves is low，it is urgent to find strategically successive areas. The Lower Permian Fengcheng formation is the most important source rocks in the basin，but its gas generation potential has rarely been investigated. Based on the latest drilling and seismic data，the gas generation potential of the Fengcheng formation was systematically analyzed by means of hydrocarbon generation kinetics，isotope kinetics，organic petrology and basin simulation. The results show that the Fengcheng formation source rocks are complex in lithology，including dark shale，as well as sedimentary tuff，tuff-bearing dolomitic mudstone，calcareous mudstone，silicified dolomitic shale and silico-boronic sodalite，and contain the organic matters of typeⅠ-Ⅱ₁，indicating moderate-good source rocks. The methane yield of the Fengcheng formation source rocks is high with a maximum of 650 mL·g TOC. In the Shawan sag and West Pen-1 sag，the Fengcheng formation source rocks reached the peak of gas generation in the Early and Late Cretaceous respectively，and covered an area with the gas generation intensity higher than 20×10⁸ m³/km² of 13 000 km²，which suggests its resource potential of forming a medium-large gas field. A large amount of high-mature oil-type natural gas from the Fengcheng formation has been discovered in the periphery of the two sags，and favorable exploration targets are also found in near-source or inner-source traps，which are expected to become new fields for gas exploration in Junggar basin.

Key words: Junggar basin, Central depression, West Pen-1 sag, Shawan sag, Permian, Fengcheng formation, hydrocarbon generation potential, natural gas exploration

CLC Number:

TE122.23

GONG Deyu, LIU Hailei, YANG Haibo, LI Zonghao, WANG Ruiju, WU Weian. Gas Generation Potential of Fengcheng Formation Source Rocks and Exploration Fields in Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(6): 674-683.

Figures/Tables 10

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