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川中蓬莱气田灯影组油气成藏过程——来自沥青形态、低温热年代学和流体地球化学的制约

DENG Bin LIU Shugen LU Pengda LI Zeqi WU Juan LI Wenzheng SUN Wei TIAN Tengzhen ZHANG Xuan JIANG Hua

成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：603-619,17.
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成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：603-619,17.DOI:10.12474/cdlgzrkx.2024042602

川中蓬莱气田灯影组油气成藏过程——来自沥青形态、低温热年代学和流体地球化学的制约

The process of hydrocarbon accumulation in the Sinian Dengying Formation,Penglai gas field,central Sichuan Basin,constrained by bitumen morphology,low-temperature thermochronology,and fluid geochemistry

DENG Bin 1LIU Shugen 2LU Pengda 1LI Zeqi 1WU Juan 1LI Wenzheng 3SUN Wei 1TIAN Tengzhen 1ZHANG Xuan 4JIANG Hua5

作者信息

  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China||College of Energy(College of Modern Shale Gas Industry),Chengdu University of Technology,Chengdu 610059,China
  • 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China||College of Energy(College of Modern Shale Gas Industry),Chengdu University of Technology,Chengdu 610059,China||Xihua University,Chengdu 610039,China
  • 3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China||College of Energy(College of Modern Shale Gas Industry),Chengdu University of Technology,Chengdu 610059,China||PetroChina Hangzhou Research Institute of Petroleum Geology,Hangzhou 310023,China
  • 4. Research Institute of Petroleum Exploration and Development,Southwest Oil&Gas Field Company,PetroChina,Chengdu 610041,China
  • 5. Research Institute of Petroleum Exploration and Development(RIPED),PetroChina,Beijing 100083,China
  • 折叠

摘要

Abstract

The deep burial carbonate strata of the superimposed basins in western China are characterized by their ancient age,deep burial depths,and the superposition of multiple phases of diagenetic transformation.The complex hydrocarbon accumulation process in these strata has become a focal point of widespread attention and a key research area within the industry.This study investigates the petrology,fluid inclusions,low-temperature thermochronology,and reservoir bitumen morphology of these systems.The results show that the reservoir bitumen in the Dengying Formation of the Sinian system in the Penglai gas field in central Sichuan can be classified into two types:in situ bitumen with rimmed and clump-like structures,and ex situ bitumen characterized by"deformed,"brecciated,and fractured morphologies.In ZJ2,the fission-track age of apatite from the Jurassic Shaximiao Formation is 35±2.7 Ma,and the(U-Th)/He age is 19.0±0.5 Ma,indicating that the Cenozoic uplift and erosion reached a thickness of 2 000 m.Combining geochronology,burial-thermal history,and fluid inclusion analyses,it is suggested that the multiphase burial and hydrocarbon generation of the Qiongzhusi Formation source rock in the lower Cambrian led to two episodes of hydrocarbon charging in the Dengying Formation:during the early Cambrian to middle Ordovician,and the early Permian to Triassic.Additionally,the cracking of oil into gas during the Jurassic-Cretaceous contributed to reservoir formation,while Cenozoic uplift and erosion may have promoted the development of ex situ bitumen in the Dengying Formation.The morphology of bitumen could serve as a potential indicator for revealing the preservation and destruction of ancient deep hydrocarbon reservoirs.Accurately assessing the impact of Cenozoic uplift and erosion on the adjustment of gas reservoirs in the Dengying Formation is a critical focus for guiding the next stage of exploration in the study area.

关键词

灯影组/原位沥青/异位沥青/低温热年代学/成藏特征/川中地区

Key words

Dengying Formation/ex situ bitumen/in situ bitumen/low-temperature thermochronology/hydrocarbon accumulation/central Sichuan Basin area

分类

能源科技

引用本文复制引用

DENG Bin,LIU Shugen,LU Pengda,LI Zeqi,WU Juan,LI Wenzheng,SUN Wei,TIAN Tengzhen,ZHANG Xuan,JIANG Hua..川中蓬莱气田灯影组油气成藏过程——来自沥青形态、低温热年代学和流体地球化学的制约[J].成都理工大学学报（自然科学版）,2025,52(4):603-619,17.

基金项目

地质灾害防治与地质环境保护全国重点实验室自主研究课题(SKLGP2023Z021,SKLGP2024K030) （SKLGP2023Z021,SKLGP2024K030）

国家社会科学基金重大项目(24&ZD164). （24&ZD164）

成都理工大学学报（自然科学版）

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