Characteristics and genesis of the Feixianguan Formation oolitic shoal reservoir, Puguang gas field, Sichuan Basin, China

doi:10.1007/s11707-014-0441-z

Front. Earth Sci.

2015, Vol. 9

Issue (1) : 26-39 https://doi.org/10.1007/s11707-014-0441-z

RESEARCH ARTICLE

Characteristics and genesis of the Feixianguan Formation oolitic shoal reservoir, Puguang gas field, Sichuan Basin, China

Peiyuan CHEN^1,²(

), Xiucheng TAN^1,²(

), Huiting YANG², Ming TANG², Yiwei JIANG³, Xiuju JIN³, Yang YU^1,²

¹. State Key Laboratory of Oil and Gas Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China
². School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
³. Research Institute of Petroleum Exploration and Development, SINOPEC Zhongyuan Oilfield Company, Puyang 457001, China

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Abstract

The Lower Triassic Feixianguan Formation at the well-known Puguang gasfield in the northeastern Sichuan Basin of southwest China produces a representative oolitic reservoir, which has been the biggest marine-sourced gasfield so far in China (discovered in 2003 with proven gas reserves greater than 350×10⁸ m³). This study combines core, thin section, and scanning electron microscopy observations, and geochemical analysis (C, O, and Sr isotopes) in order to investigate the basic characteristics and formation mechanisms of the reservoir. Observations indicate that platform margin oolitic dolomites are the most important reservoir rocks. Porosity is dominated by intergranular and intragranular solution, and moldic pore. The dolomites are characterized by medium porosity and permeability, averaging at approximately 9% and 29.7 mD, respectively. ⁸⁷Sr/⁸⁶Sr (0.707536–0.707934) and δ¹³C_PDB (1.8‰–3.5‰) isotopic values indicate that the dolomitization fluid is predominantly concentrated seawater by evaporation, and the main mechanism for the oolitic dolomite formation is seepage reflux at an early stage of eodiagenesis. Both sedimentation and diagenesis (e.g., dolomitization and dissolution) have led to the formation of high-quality rocks to different degrees. Dolomite formation may have little contribution, karst may have had both positive and negative influences, and burial dissolution-TSR (thermochemical sulfate reduction) may not impact widely. The preservation of primary intergranular pores and dissolution by meteoric or mixed waters at the early stage of eogenesis are the main influences. This study may assist oil and gas exploration activities in the Puguang area and in other areas with dolomitic reservoirs.

Keywords oolite shoal reservoir carbonate diagenesis Triassic Feixianguan Formation Puguang gas field Sichuan Basin

Corresponding Author(s): Peiyuan CHEN,Xiucheng TAN

Issue Date: 01 January 2023

Cite this article:

Peiyuan CHEN,Xiucheng TAN,Huiting YANG, et al. Characteristics and genesis of the Feixianguan Formation oolitic shoal reservoir, Puguang gas field, Sichuan Basin, China[J]. Front. Earth Sci., 2015, 9(1): 26-39.

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https://academic.hep.com.cn/fesci/EN/10.1007/s11707-014-0441-z
https://academic.hep.com.cn/fesci/EN/Y2015/V9/I1/26

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