Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 159-168.doi: 10.12108/yxyqc.20240414

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and evolution model of hydrocarbon accumulation of Cambrian Longwangmiao Formation in the north slope of central Sichuan paleo-uplift

LU Keliang1,2, WU Kangjun1,2, LI Zhijun1,2, SUN Yonghe2, XU Shaohua1,2, LIANG Feng3, LIU Lu2, LI Shuang1,2   

  1. 1. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
    2. Chongqing Key Laboratory of Complex Oil & Gas Field Exploration and Development, Chongqing 401331, China;
    3. Central Sichuan Oil and Gas District, PetroChina Southwest Oil & Gas Field Company, Suining 629000, Sichuan, China
  • Received:2023-05-10 Revised:2023-05-23 Online:2024-07-01 Published:2024-07-04

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Abstract: Based on logging，well log，core analysis and laboratory data，a study was conducted on the hydro‐carbon accumulation conditions，hydrocarbon filling characteristics，and accumulation evolution model of Lower Cambrian Longwangmiao Formation in the north slope of central Sichuan paleo-uplift. The results show that：（1）The natural gas of Lower Cambrian Longwangmiao Formation in the north slope of central Sichuan paleo-uplift has good hydrocarbon accumulation conditions. The source rocks of underlying Qiongzhusi Formation have two hydrocarbon generation centers in the central and western rift troughs of the north slope，with an average TOC of 1.90% and 3.46%，respectively. The organic matter is mainly type Ⅰ kerogen，which can provide sufficient and high-quality hydrocarbon sources. The grain-shoal karst reservoirs developed within Longwangmiao Formation and the dense argillaceous dolomites of the overlying the Gaotai Formation form a dominant reservoir-cap assemblage. The widely developed oil-source faults in the study area can serve as vertically dominant migration channels for efficient hydrocarbon migration.（2）The Longwangmiao Formation in the study area has three stages of hydrocarbon accumulation characteristics：The first stage of filling occurred at the end of Late Triassic（approximately 214-206 Ma），with a large amount of mature oil accumulating to form paleo-oil reservoirs. In the late Early Jurassic（approximately 193-186 Ma），the second stage of filling occurred，characterized by a mixed filling of more oil and less gas. At the end of the Middle Jurassic（approximately 170-164 Ma），the third stage of filling occurred，with a large amount of oil cracked gases filling the reservoir and accumulating to form the current gas reservoir.（3）The hydrocarbon accumulation evolution of Longwangmiao Formation in the study area can be divided into four stages：the early Caledonian to pre Permian stage with a small amount of low mature oil filling，the Permian to Triassic stage with a large amount of mature oil filling to form ancient oil reservoirs，the Middle Jurassic to Cretaceous stage with the destruction of paleo-oil reservoirs to form cracked gas reservoirs，and the Late Cretaceous to present stage with gas reservoir adjustment.

Key words: grain-shoal karst reservoir, argillaceous dolomite cap rock, reservoir-cap assemblage, oil-source fault, paleo-oil reservoirs, mixed filling, cracked gas, Longwangmiao Formation, Cambrian, north slope, central Sichuan paleo‐uplift

CLC Number: 

  • TE122.1
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