川东北地区长兴组酸性气藏中硫化氢来源及成因

doi:10.11743/ogg20150202

Abstract

Abstract: High H₂S concentrations found in gas reservoirs within the Upper Permian Changxing Fm(P₃ch)and Lower Triassic Feixianguan Fm(T₁f)are generally thought to be formed via a process known as thermochemical sulfate reduction(TSR).However,unlike the T₁f Fm,rare gypsum/anhydrite beds or anhydrite nodular were found in the P₃ch Fm.This cast doubts over the accepted model for the souring process of the P₃ch reservoirs.This study provides an analysis of palaegeopressure and carrier system within this system using carbonate-associated sulfate(CAS),isotopes,trace and rare earth element data.Results shows that,the H₂S of high concentrations within the P₃ch reservoirs were not derived from downward migration of sour gas from the T₁f Fm,but were generated in situ through TSR;reactive sulfates were mainly derived from cross-formational brines migration from the T₁f Fm,but with insignificant contributions from the Late Permian P₃ch seawater and sulfate-rich brines within the Lower Triassic Jialingjiang Fm and Middle Carboniferous Honglong Fm formations,and the down-migration of T₁f brines may have resulted in the P₃ch TSR calcites having positive Eu anomaly,high Sr contents(up to 7 767 ppm)and Ba contents(up to 1 279 ppm)close to the T₁f TSR calcite,and ⁸⁷Sr/⁸⁶Sr ratios(0.707 24~0.707 55)more radiogenic than those of the late Permian seawater;the cross-formational brine flow mainly occurred during sedimentary stage or the early stages of diagenesis,and seepage reflux during contemporaneous-penecontemporaneous stage and differential compaction flux during early-mid burial stage might serve as the main migration mechanisms;④CAS released during dolomization was another possible sulfate source,which brought the δ³⁴S values of H₂S and bitumen a little lower than those of the T₁f Fm.

Key words: CAS, differential compaction, TSR, H₂S, sour gas reservoir, Changxing Formation, northeastern Sichuan Basin

CLC Number:

TE122.1

Li Kaikai, Cai Chunfang, Jiang Lei, He Xunyun, Huang Zheng. Origin of H₂S in sour gas reservoirs in the Upper Permian Changxing Formation in northeastern Sichuan Basin[J]. Oil & Gas Geology, 2015, 36(2): 183-192.

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Origin of H₂S in sour gas reservoirs in the Upper Permian Changxing Formation in northeastern Sichuan Basin

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Origin of H2S in sour gas reservoirs in the Upper Permian Changxing Formation in northeastern Sichuan Basin

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Origin of H₂S in sour gas reservoirs in the Upper Permian Changxing Formation in northeastern Sichuan Basin