摘要
贵州石头寨二叠系古油藏是滇黔桂地区众多上古生界生物礁型古油藏的典型代表。该古油藏发育了三期溶孔、裂缝充填方解石,其中含丰富的油气包裹体,三期油气包裹体组合依次为:少量液烃包裹体→液烃包裹体+气烃包裹体→气烃包裹体,与油气包裹体共生的气液水包裹体的均一温度分别为77℃～84℃、91℃～103℃和103℃～155℃。根据含油气包裹体的均一温度,结合沉积盆地热演化史和储层埋藏史,确定石头寨古油藏三期油气充注时间分别为238～235Ma、233～230Ma 和230～185Ma,第三期裂缝充填方解石的 Sm-Nd 等时线年龄为182±21Ma。古油藏的油气充注始于印支中期,于印支晚期至燕山早期达到高峰,燕山中晚期以来遭受破坏形成现今的残余古油藏。
The Shitouzhai Permian paleo-oil reservoir in Guizhou province is a typical example of numerous Upper Paleozoic reeftype paleo-oil reservoirs in the Yunnan, Guizhou and Guangxi region. Three stages of pore and fissure filling calcites containing abundant hydrocarbon inclusions are observed. The association of hydrocarbon inclusions in the calcites of three stages is characterized by liquid hydrocarbon inclusions, liquid-gas hydrocarbon inclusions and gas hydrocarbon inclusions, respectively. The homogenization temperatures of saline aqueous inclusions coexisting with the hydrocarbon inclusions in the three stage calcites are 77℃ -84℃, 91℃- 103℃ and 103℃ - 155℃, respectively. Based on the homogenization temperatures, coupled with thermal and burial histories of the sedimentary basin and reservoir, three hydrocarbon charges are determined to be 238 - 235Ma, 233 - 230Ma and 230 - 185Ma, respectively. Sm-Nd isochon of the third stage fissure-filling calcite from the reservoir gives an age of 182 ± 21Ma. It is thus suggested that the hydrocarbon charge of the Shitouzhai reservoir began during the middle Indosinian and reached to a peak during the late Indosinian to the early Yanshannian. The destruction of the reservoir occurred since the middle to late Yanshannian.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期2279-2286,共8页
Acta Petrologica Sinica
基金
国家自然科学基金(40573031
40772060)
国家重点基础研究发展规划(2006CB701402)
地质过程与矿产资源国家重点实验室
关键词
流体包裹体
SM-ND同位素
成藏时代
古油藏
石头寨
Fluid inclusions, Sm-Nd isotopes, Time of reservoir formation, Paleo-oil reservoir, Shitouzhai
