惠安堡—马家滩地区上古生界含油气系统

【作者】 安文宏；

【导师】 周立发；

【作者基本信息】 西北大学 ， 矿产普查与勘探， 2005， 硕士

【摘要】 惠安堡—马家滩地区地处鄂尔多斯盆地西缘地区,跨越西缘冲断带和天环坳陷两大构造单元,上古生界油气勘探程度较低,从目前的研究结果看来惠安堡—马家滩地区上古生界作为勘探目的层前景较好,鉴于此,开展上古生界含油气系统研究利于系统性认识油气成藏条件并对下一步油气勘探工作进行指导,以期找到新的油气资源。 本文采用现代测试技术方法,注意区域资料与单井数据相结合,野外工作与室内工作相结合,从构造演化和沉积体系演化入手,以含油气系统理论为指导,坚持整体、动态、综合分析的原则,对研究区上古生界含油气系统静态地质要素与动态地质作用及其组合关系进行研究。主要进行了以下研究工作:(1)对惠安堡—马家滩地区上古生界生油条件进行研究。(2)对惠安堡—马家滩地区上古生界储集体进行储集性能研究。(3)对研究区上古生界圈闭形成及其类型和盖层封盖性能进行分析。(4)结合埋藏史、热演化史及生烃史对研究区上古生界含油气系统关键时刻进行确定。(5)在油气成藏事件组合分析的基础上对研究区上古生界进行含油气系统的划分与评价。主要成果及认识如下: 1.惠安堡—马家滩地区上古生界烃源岩以山西组和太原组有机质丰度较高,石盒子组基本不发育烃源岩;有机质类型以Ⅲ型(腐殖型)为主,有机质成熟度较高,主要处于以高成熟—过成熟阶段。 2.山西组和下石盒子组的砂岩为主要的储集体,储集性能北好南差。 3.研究区上古生界主要发育构造圈闭类型和地层圈闭类型,构造圈闭主要以晚侏罗世末燕山运动和早第三纪末喜马拉雅运动造成的构造圈闭为其主体。地层圈闭主要形成于晚古生代。流体圈闭是燕山和喜山运动的产物,在研究区不占主要地位。 4.研究区上石盒子组和山西组是良好的区域盖层,而局部盖层在太原组、山西组、石盒子组均有发育,且封盖性能较好,以烃浓度封闭和物性封闭为主。 5.对研究区上古生界成藏事件进行分析,将晚白垩世末确定为关键时刻,成藏要素配置良好。 6.在以上研究基础上对研究区上古生界划分出两个独立含油气系统并将甜水-石沟驿太原组(?)含油气系统综合评价为好的含油气系统,石沟驿—灵武(?)更多还原

【Abstract】 Huianbu-Majiatan Area ,located on the west edge of Ordos Basin, covers two tectonic units: West Edge Fault Belt and Tianhuan Depression, of which the Upper Paleozoic has not been invested adequate exploration. Based on the former research achievements , it is turned out that Upper Paleozoic of Huianbu-Majiatan Area has preferable exploration potential .Meanwhile studying the petroleum system of upper Paleozoic in Huianbu-Majiatan Area will make for systematically investigating petroliferous geologic condition and directing the future exploration decisions, which is expected to find new energy sources.Using modern testing techniques, combining the regional data with well data synthesizing outcrop and indoor work , beginning with the tectonic evolution and the sedimentation evolution ,the static elements and geologic process are studied directed by the petroleum system theory and concerned with principles of holism, development and integration. The research work is concentrated on the following aspects, (1)studying the hydrocarbon source rock condition in studied area ; (2)studying the reservior in studied area and its reserving capability; (3) studying the forming process and the type of trap and sealing capability of the cap; (4) Based on the studying results of burial history ,thermal history and hydrocarbon generation history, the critical moment is ascertained; (5)the petroleum system of upper Paleozoic in the studied area is compartmentalized and assessed. The research conclusions are as follows.1.Shanxi Formation and Taiyuan Formation source rock bear characteristics of high organic material content, contrarily, Shihezi Formation can not be identified as effective hydrocarbon source rock. Ⅲ-type organic material is in the highest flight and bears high maturity degree.2.The reservior is mainly constituted by Shanxi Formation and Lower Shihezi Formation.The reserving capability of the north stratum is better than that of the south.3.The structural trap and stratigraphic trap constitute the main type in the studied area. The structural trap formed in Yanshan Movement of the late Jurassic epoch and Himalayan Movement of early Tertiary epoch. The stratigraphic trap formed in late Paleozoic era. Meanwhile fluid trap ,which mainly formed in Yanshan Movement and Himalayan Movement, is not dominant. 4. Upper Shihezi Formation and Shanxi Formation are favorable regional cap. Andpartial cap ,which consists of Taiyuan ,Shanxi and Shihezi Formation,the sealing capability is favorable and have two sealing mechanisms: hydrocarbon concentration sealing mechanism and physical capability sealing mechanism.5.Synthesizing the analysis of hydrocarbon generation history ,the late Cretaceous epoch is ascertained as the critical moment .And the elements of petroleum system have a favorable collocating sequence.6.Based on the results hereinbefore, two petroleum systems are confirmed. And Tianshui-Shigouyi Taiyuan Formation (?) Petroleum System is considered excellent and Shigouyi-Lingwu Shanxi Formation (?) Petroleum System takes second place.更多还原