准中地区侏罗-白垩系优质储层形成机理  

FORMATION MECHANISM OF HIGH QUALITY JURASSIC-CRETACEOUS RESERVOIRS IN THE CENTRAL JUNGGAR BASIN

作　　者：袁海锋[1] 徐国盛[1] 董臣强[2] 王军[2] 陈春竺[3] 

机构地区：[1]成都理工大学能源学院,610059 [2]中国石化胜利油田有限公司新疆勘探开发分公司 [3]中国石油西南油气田公司川东开发公司

出　　处：《天然气工业》2008年第5期14-17,136-137,共4页Natural Gas Industry

基　　金：国家重点基础研究发展规划(“973”)项目“中国典型叠合盆地深部流体与浅部流体相互作用及其成藏效应”(编号:G1999043309)的资助

摘　　要：准噶尔盆地中部Ⅲ区块侏罗-白垩系储层埋藏深度为5800～6100m，具有较好的孔渗性，为一套深层优质储层。为探讨其形成机理，在对该区侏罗-白垩系储层特征研究的基础上，采用铸体薄片观察、成岩序列划分、能量场分析、盆地模拟等方法对该套储层进行了深入分析。结果表明：①水动力较强的沉积砂体是深部储层发育的基础；②低地温场的存在可有效滞后成岩作用的发生，使原生孔隙得以保存；③晚期快速埋藏，导致地层欠压实，并进而产生异常高压，使储层在埋藏很深的情况下仍具有较高的孔渗性；④早期淡水溶蚀和晚期有机酸溶蚀作用，较大地改善了储层物性；⑤适量的环边绿泥石也对储层起到了一定的保护作用。在上述因素的综合作用下，才使得该套储层在埋藏很深的情况下，仍不失为一套优质储层。The Jurassic-Cretaceous reservoirs in Block Ⅲ in the central Junggar basin are deep and high-quality reservoirs with burial depth ranging from 5800 to 6100 m and relatively good poroperm characteristics. In order to reveal their mechanisms of formation, various methods, including observation of cast thin section, division of diagenetic sequences, analysis of energy field and basin modeling, are used to study these reservoirs in depth based on a thorough study of the characteristics of the Jurassic-Cretaceous reservoirs in the study area. The following understandings are obtained. ① Sandbodies with relatively strong hydrodynamic conditions were the basis for the formation of deep reservoirs; ② The existence of low geothermal field might effectively impede diagenesis, resulting in the preservation of the primary pores; ③ Late rapid burial resulted in uncompaction of the formations and anomalous pressure, thus the reservoirs still preserved relatively good poroperm characteristics in deep burial; ④ Early fresh water dissolution and late organic acid dissolution greatly improved the poroperm characteristics of the reservoirs; ⑤ Appropriate amount of rim chlorite also played an active role in the protection of reservoirs. The combined actions of the above factors led to the development of high-quality reservoirs with very large burial depth.

关 键 词：准噶尔盆地 中部 侏罗纪 白垩纪 深层 储集层 形成 机理 

分 类 号：P618.13[天文地球—矿床学]