四川盆地东南缘震旦系—古生界古油藏特征  

Characteristics of Paleo Oil Pools from Sinian to Lower Paleozoic in Southeastern Margin of Sichuan Basin

作　　者：黄文明[1] 刘树根[1] 徐国盛[1] 王国芝[1] 马文辛[1] 张长俊[1] 宋光永[1] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059

出　　处：《地质论评》2011年第2期285-299,共15页Geological Review

基　　金：国家重点基础研究发展计划"973"项目"中国海相碳酸盐岩层系深层油气成藏机理"(编号2005CB422106);中国石化海相前瞻性项目"华南古板块地裂运动与海相油气前景(编号PH08001)"的成果

摘　　要：震旦系古油藏具有两期储层沥青,古生界仅见有一期储层沥青。震旦系储层沥青丰富,其丰度受到构造岩溶不整合面控制,古油藏为岩性—构造古油藏;古生界储层沥青含量较少,分布明显受到岩性控制,古生界古油藏为小型的岩性古油藏。丁山—林滩场构造带震旦系古油藏恢复规模为8.63×108t,裂解生气量为5348.698×108m3;良村志留系古油藏规模为2.62×104t,裂解气量为1.62×107m3。震旦系—古生界储层沥青为高温热演化产物。各种指标综合分析表明,震旦系和寒武系储层沥青来自于寒武系烃源岩,志留系储层沥青则为震旦系古油藏原油跨层运移、逸散充注,二叠系储层沥青则与下志留统烃源岩相关。总体上,震旦系—古生界储层沥青的形成与烃源岩生烃和构造演化密切相关,震旦系第一期储层沥青形成时期为加里东期,震旦系第二期沥青和寒武系—二叠系储层沥青则为印支期—燕山期原油高温裂解形成。原油裂解气是震旦系—下古生界(包括二叠系)十分重要的气源之一,油气的跨层运移导致奥陶系和志留系具有良好的勘探前景,特别是在川东—渝东地区。Based on the surface geological investigation ,thin sections study of profile and wells,this paper analyzed the characteristics and the relationship of reservoir bitumen with other minerals in outcrops,drilling cores by microscope,and had an oil to source correlation by geochemical methods. Some conclusions drawn are as follows：① Two generations reservoir bitumen have been found in the Sinian,but just one generation in the Lower Paleozoic. Reservoir bitumen in the Sinian is very abundant and its distribution is controlled by the unconformity karstification. Paleo oil pool of the Sinian is structural lithological oil pools. Slight porous reservoir （intercrystalline pores and intercrystalline solution pores） occurred in the Paleozoic,which controlled by the burial dissolution and recrystallization,and so on. ② Reservoir bitumen content of the Paleozoic is less and its distribution obviously controlled by lithology. The Paleozoic paleo oil pool is a little lithological oil reservoir. ③ The Sinian paleo oil poos in the Dingshan—Lintanchang structural belt is 8.63×108t,and oil cracking gas is 5348.698×108m3. The Silurian paleo oil pool in Liangcun is 2.62×104t,oil cracking gas is 1.62×107m3. ④ Reservoir bitumen from the Sinian to the Paleozoic is a thermal evolution product. The Sinian and Cambrian reservoir bitumen is from the Cambrian source rocks,and the Silurian bitumen is from oil transformational migration and charging of the Sinian paleo oil pool. ⑤ Overall,reservoir bitumen from the Sinian to Paleozoic formation is closely related to the hydrocarbon generation of source rocks and tectonic evolution. The formation time of the first generation bitumen of the Sinian is Caledonian,and formation time of the second generation bitumen of the Sinian and bitumen is from the Cambrian to Permian,is from high temperature cracking in Indosinian—Yanshanian. The gas from oil cracking is one of the most important gas resources from the Sinian to Lower Paleozoic （including Permian） ,and the Ordovici

关 键 词：震旦系 古生界 古油藏 原油裂解 储层沥青 跨层运移 四川盆地东南缘 

分 类 号：P618.13[天文地球—矿床学]