文档介绍：: .
第 42 卷第 3 期 Longmen Mountain
YANG Yu1, JIANG Pengfei1, ZHANG Benjian2, XIAO Di3,
WANG Hua2, LEI Cheng2, ZHANG Ya2, CHEN Xiao2, LIU Ran2, LI Ya2
(1. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China; and Development Research Institute,
PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China; 3. The Key Laboratory of Natural Gas, Southwest Pe-
troleum University, Chengdu, Sichuan 610500, China)
Natural Gas Industry, , , -11, 3/25/2022. (ISSN 1000-0976; In Chinese)
Abstract: Previous exploration in the foothill complex structure belt of Longmen Mountain in the northwestern Sichuan Basin
focuses on the thrust nappe belt in the mid-deep strata. And recently, great breakthroughs have been made in the exploration of
Middle Permian natural gas in the area, and an ultra-deep integrated giant gas field has been discovered in the Qixia Formation
of Shuangyushi structure, which reveals a new exploration area of large-scale hydrocarbon accumulation, ., the ultra-deep au-
tochthonous structure thrust buried belt and front back-thrust. In order to provide the basis and reference for the next oil and gas
exploration and deployment, this paper summarizes the formation mechanisms and models of the gas reservoir in Qixia Formation
of Shuangyushi structure based on the analysis of hydrocarbon accumulation factors such as source-reservoir-cap assemblages and
traps. And the following research results are obtained. First, the Qixia Formation reservoir in this area is controlled by platform
edge beach microfacies, which is reworked into a pore-cavity reservoir with dissolved intercrystalline pores and cavity as the
main reservoir space by superimposed karst and dolomitization in the early diagenesis stage. Second, the source of nat