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

Content Provider	Springer Nature Link
Author	Chen, Peiyuan Tan, Xiucheng Yang, Huiting Tang, Ming Jiang, Yiwei Jin, Xiuju Yu, Yang
Copyright Year	2015
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 350×10$^{8}$ m$^{3}$). 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. $^{87}$Sr/$^{86}$Sr (0.707536–0.707934) and δ$^{13}$C$_{PDB}$ (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.
Starting Page	26
Ending Page	39
Page Count	14
File Format	PDF
ISSN	20950195
Journal	Frontiers of Earth Science in China
Volume Number	9
Issue Number	1
e-ISSN	20950209
Language	English
Publisher	Higher Education Press
Publisher Date	2014-06-20
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	oolite shoal reservoir carbonate diagenesis Triassic Feixianguan Formation Puguang gas field Sichuan Basin Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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Primary intergranular pores in oolitic shoal reservoir of lower triassic feixianguan formation, Sichuan Basin, Southwest China: Fundamental for reservoir formation and retention diagenesis

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

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