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Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China
Jiang, Lei1,2,3; Hu, Suyun4; Zhao, Wenzhi4; Xu, Zhaohui4; Shi, Shuyuan4; Fu, Qilong2; Zeng, Hongliu2; Liu, Wei4; Fall, Andras2
2018-12-01
Source PublicationAAPG BULLETIN
ISSN0149-1423
Volume102Issue:12Pages:2599-2628
AbstractThe uppermost Middle Triassic Leikoupo Formation in the western Sichuan Basin of China has recently been shown to host as much as 5.3 tcf (1.5 x 10(12) m(3)) of natural gas resources. The reservoir rocks, composed mainly of microbially derived dolo-mudstone (e.g., thrombolites and stromatolites), are characterized by low porosity (<8%) and permeability (<0.001 to 10 md). The limestone is commonly tight and not of reservoir quality because of abundant meteoric calcite cementation, whereas the dolostone has various types of pores dominated by solution-enlarged pores and vugs, microbial framework pores, and micropores. Breccias are well developed in places, probably because of dissolution of underlying evaporites (e.g., anhydrite) by an influx of low-salinity fluids (e.g., freshwater and seawater) during an early burial stage. Early dolomitization created micropores in the dolomudstone, and subsequent diagenetic events were dominated by calcite, dolomite, quartz cementation, pyrite replacement, compaction, fracturing, and development of stylolites. Localized hydrothermal activity has been evidenced by high homogenization temperatures (similar to 160 degrees C-200 degrees C) obtained from fluid inclusions in fracture-filling cements. Bacterial sulfate reduction probably resulted in H2S generation, pyrite precipitation, and solution-enlarged pore and vug formation, whereas part of the current H2S in these reservoirs may have been sourced from thermochemical sulfate reduction or an underlying formation (e.g., the Feixiangguan Formation). Development of microfractures and associated micropores was probably the final diagenetic event, which improved pore interconnectivity. This study confirms the effect of diagenesis on the development of a microbial dolomudstone reservoir, which may be applicable to other similar microbial carbonate reservoirs elsewhere, for example, Middle Triassic sections of the Tethys region and offshore Brazil.
DOI10.1306/05111817021
WOS KeywordTHERMOCHEMICAL SULFATE REDUCTION ; JURASSIC SMACKOVER FORMATION ; FEIXIANGUAN FORMATION ; GAS-RESERVOIRS ; DOLOMITE RESERVOIRS ; TARIM BASIN ; REFLUX DOLOMITIZATION ; DEPOSITIONAL TEXTURE ; POROSITY EVOLUTION ; HYDROGEN-SULFIDE
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000455596500007
PublisherAMER ASSOC PETROLEUM GEOLOGIST
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90210
Collection油气资源研究院重点实验室
Corresponding AuthorJiang, Lei
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, 19 Beitucheng West Rd, Beijing 100029, Peoples R China
2.Univ Texas Austin, Jackson Sch Geosci, Bur Econ Geol, 10100 Burnet Rd, Austin, TX 78713 USA
3.Chinese Acad Sci, Inst Earth Sci, 19 Beitucheng West Rd, Beijing 100029, Peoples R China
4.Res Inst Petr Explorat & Dev Petro China, 20 Xueyuan Rd, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Lei,Hu, Suyun,Zhao, Wenzhi,et al. Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China[J]. AAPG BULLETIN,2018,102(12):2599-2628.
APA Jiang, Lei.,Hu, Suyun.,Zhao, Wenzhi.,Xu, Zhaohui.,Shi, Shuyuan.,...&Fall, Andras.(2018).Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China.AAPG BULLETIN,102(12),2599-2628.
MLA Jiang, Lei,et al."Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China".AAPG BULLETIN 102.12(2018):2599-2628.
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