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| 川东北地区上二叠统油气储层中流体包裹体特征及成藏期研究 | |
| 引用本文： | 李保华,付绍洪,顾雪祥,徐仕海,黄增保,杨悦.川东北地区上二叠统油气储层中流体包裹体特征及成藏期研究[J].矿物岩石地球化学通报,2012,31(2):105-113. |
| 作者姓名： | 李保华 付绍洪 顾雪祥 徐仕海 黄增保 杨悦 |
| 作者单位： | 1. 成都理工大学地球科学学院,成都,610059 2. 中国科学院地球化学研究所,贵阳,550002 3. 中国地质大学地球科学与资源学院,北京,100083 |
| 基金项目： | 四川省教育厅自然科学基金，国家自然科学基金 |
| 摘 要： | 川东北地区是中国重要的天然气勘探区之一.为了探讨该区上二叠统储层流体特征、天然气充注的时期,本文应用包裹体、同位素地球化学的原理和方法,对区内上二叠统长兴组和吴家坪组储层中流体包裹体产出特征、岩相学特征、包裹体成分和显微测温,以及裂缝充填方解石的Sm-Nd同位素年龄进行了研究.结果表明,上二叠统储层中存在三期油气包裹体,其组合依次为:少量液相烃包裹体→黄色、黄褐色液相烃包裹体+气液烃包裹体→气相烃包裹体+烃—水包裹体+沥青包裹体,测得与油气包裹体共生的气液水包裹体均—温度分别为71～111℃、117～148℃和149～217℃.根据气液水包裹体的均—温度,结合沉积盆地热演化史和储层埋藏史,确定上二叠统储层中三期油气充注时间分别为202～185Ma、182～169 Ma和167～120Ma,第三期裂缝充填方解石的Sm-Nd等时线年龄为126±11Ma.说明古油藏的油气充注始于燕山早期,燕山中晚期达到高峰,喜马拉雅期运动对早期形成的气藏起抬升、剥蚀破坏作用. |
| 关 键 词： | 川东北地区 流体包裹体 成藏期 上二叠统储层 |
Fluid Inclusion Characteristics of the Later Permain Reservoir in the Northeastern Sichuan and Implications for Petroleum Accumulation |
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| LI Bao-hua , FU Shao-hong , GU Xue-xiang , XU Shi-hai , HUANG Zeng-bao , YANG Yue.Fluid Inclusion Characteristics of the Later Permain Reservoir in the Northeastern Sichuan and Implications for Petroleum Accumulation[J].Bulletin of Mineralogy Petrology and Geochemistry,2012,31(2):105-113. | |
| Authors: | LI Bao-hua FU Shao-hong GU Xue-xiang XU Shi-hai HUANG Zeng-bao YANG Yue |
| Institution: | 1.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China; 2.Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China; 3.College of Earth Sciences and Mineral Resources,China University of Geosciences,Beijing 100083,China |
| Abstract: | The northeastern Sichuan is one of important natural gas exploration areas in China.In order to reveal the fluid characteristics of later Permian reservoirs in the area and the charging time of natural gases,this paper studied occurrence,composition and petrographic characteristics of inclusions,micro-thermometric data,and Sm-Nd isotopes in calcites from Changxing and Wujiaping formations of northeastern Sichuan using isotope geochemistry principles and the methods.The result indicated that there are three episodes hydrocarbon inclusions in later Permain reservoirs of this area,that is liquid hydrocarbon inclusion,liquid hydrocarbon inclusion + gas-liquid hydrocarbon inclusion,and gas hydrocarbon inclusion + asphalt inclusion + hydrocarbon-H2O inclusion.The homogenization temperatures of the gas-liquid H2O inclusion,which coexist with the hydrocarbon inclusion in the three stages,are 71-111℃,117-148℃ and 149-217℃,respectively.According to results of the homogenization temperature,the thermal evolution history of the sedimentary basin and the burial histories of the reservoir,three episodes hydrocarbon charges are determined as 202-185 Ma,182-169 Ma and 167-120 Ma,respectively.The Sm-Nd age of calcite filling the fissures of the third stage is of 126±11 Ma.It is suggested that the hydrocarbon charge of the later Permain reservoir began at the early Yanshannian and reached peak at the intermediate-late Yanshannian and the Himalayan movement exerted lifting and corroding effects on the reservoir. |
| Keywords: | northeastern Sichuan fluid inclusions time of reservoir formation later Permian reservoir |
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