Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 103-115.doi: 10.12108/yxyqc.20220410

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir characteristics and genesis of dolomite of Middle Permian Qixia Formation in southwestern Sichuan Basin

LI Rong1,2, SU Chengpeng1, JIA Huofu1, SHI Guoshan1, LIN Hui1, LI Suhua1   

  1. 1. Research Institute of Exploration and Development, Sinopec Southwest Oil and Gas Company, Chengdu 610041, China;
    2. Geological Center Laboratory, Sinopec Southwest Oil and Gas Company, Chengdu 610081, China
  • Received:2022-01-17 Revised:2022-02-24 Online:2022-07-01 Published:2022-07-07

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Abstract: Through core observation,thin section identification,cathodoluminescence and geochemical analysis, the characteristics and genesis of dolomite of Middle Permian Qixia Formation in southwestern Sichuan Basin were studied. The results show that:(1)The matrix dolomites of Qixia Formation in the study area are mainly fine-medium crystalline dolomites,followed by powder-fine crystalline dolomites,accompanied by a small amount of coarse-grained saddle-shaped dolomites.(2)The fine-medium crystalline dolomites in the study area are consistent with the rare earth element(REE)matching model of calcite cement of granular limestone in the same period,with typical REE distribution characteristics of modern seawater,and it was formed by the replacement of granular limestone deposited in the turbulent environment of semi-restricted water body. The powder-fine crystalline dolomites have the morphological characteristics of flat REE matching with high ΣREE content,weak positive anomaly of CE and overall uplift of LREE. It was metasomatized by micritic limestone or granular marl deposited in semi-restricted water and quiet environment. The contents of Fe and Mn in different types of dolomites show a synergistic increase with the deepening of dolomitization,indicating that they have the same genesis. (3)There existed local evaporation restriction environment among the bioclastic shoals developed along the slope break zone in the study area,forming concentrated salted seawater,and penecontemporaneous reflux infiltration dolomitization resulted in the formation of powder-fine crystalline dolomites. From early diagenetic stage to shallow burial stage,the magmatic activity in the large Emei igneous province provided abnormally high heat, and the high-temperature pore water further interacted with the pre dolomite to form fine-medium crystalline dolomites,with the characteristics of fog core and bright edge. During the burial period,deep hydrothermal fluids migrated along the fractures and precipitated saddle-shaped dolomites in the fracture and surrounding rocks. The superposition of semi-restricted environment and heat source caused by bioclastic shoals is the key to the formation of dolomite in the study area.

Key words: penecontemporaneous reflux infiltration, hydrothermalism, dolomitization, interbank sea, semi-restricted environment, Qixia Formation, Middle Permian, southwestern Sichuan Basin

CLC Number: 

  • P618.13
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