Origin of natural sulphur-bearing immiscible inclusions and H2S in oolite gas reservoir, Eastern Sichuan
Origin of natural sulphur-bearing immiscible inclusions and H2S in oolite gas reservoir, Eastern Sichuan
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DOI：
10.1007/s11430-006-0242-7
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发表时间：
2006-03
影响因子：
5.7
通讯作者：
Liu Dehan;Xia Xian-ming;Xiong Yong-qiang;Geng An-song;Tian Hui;Peng Ping’an;Shen Jia-gui;Wang Yun-peng
中科院分区：
文献类型：
--
作者：
Liu Dehan;Xia Xian-ming;Xiong Yong-qiang;Geng An-song;Tian Hui;Peng Ping’an;Shen Jia-gui;Wang Yun-peng
根据显微镜观察和激光拉曼分析结果，在四川开县金竹-罗家地区下三叠统飞仙关组含H2S气藏碳酸盐岩中发现了多种特殊形式的不混溶包裹体，包括硫、液态烃、沥青等。根据有关地层的岩性、埋藏史以及流体包裹体均一温度、沥青反射率等测量结果，认为气藏中的H2S是在晚白垩世高温（140°C ~ 17°C）油裂解成气阶段，储层中的烃类与含膏白云岩段中的CaSO 4发生热反应的产物。此后，对储层中大量不混溶包裹体的研究表明，元素硫是早期形成的部分H2S氧化和硫酸盐之间进一步反应的产物，在86°C的温度下，含H2S气藏中地质流体中的碳氢化合物和H2S-89 ℃，压力为340× 105 Pa，第三纪处于以降温降压为特征的区域隆升阶段。同时，该阶段形成的石膏、硬石膏、方解石等包裹体会捕获元素硫等颗粒，形成各种特殊形式的不混溶包裹体，这些包裹体包含着有关储层流体复杂性以及气藏中H2S和天然硫来源的信息。
Based on results of microscopic observation and laser Raman analysis about fluid inclusions, multiple special forms of immiscible inclusions that contain sulphur, liquid hydrocarbon, bitumen,etc.were discovered in samples collected from the H2S gas reservoir-containing carbonates in the Lower Triassic Feixianguan Formation in the Jinzhu-Luojia area, Kai County, Sichuan Province. Based on the lithology and burial history of the strata involved as well as measurement results of homogenization temperature of fluid inclusions, bitumen reflectivity,etc., it is concluded that the H2S in the gas reservoir resulted from the thermal reaction between hydrocarbons in reservoir and CaSO4in the gypsum-bearing dolostone section at the high temperature (140°C–17°C) oil-cracked gas formation stage in Late Cretaceous. Thereafter, research on a great number of immiscible inclusions in the reservoir reveals that elemental sulphur resulted from oxidation of part of the earlier-formed H2S and further reaction between sulphates, hydrocarbons and H2S in geological fluids in H2S-bearing gas reservoir at a temperature of 86°C–89°C and a pressure of 340×105Pa and during the regional uplift stage as characterized by temperature decrease and pressure decrease in Tertiary. Meanwhile, gypsum, anhydrite and calcite formed at this stage would trap particles like elemental sulphur and result in a variety of special forms of immiscible inclusions, and these inclusions would contain information concerning the complexity of the fluids in the reservoir and the origin of H2S and natural sulphur in the gas reservoir.