苏北盆地溱潼凹陷断阶带油气藏的成藏期次  

Formation stages of petroleum accumulations in fault terrace belts of the Qin- tong subbasin,northern Jiangsu basin,China.

作　　者：陆黄生[1] 杨永才[2] 刘军[3] 方朝合[4] 秦黎明[2] 张枝焕[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]中国石油大学油气资源与探测国家重点实验室,北京102249 [3]胜利油田地质科学研究院,山东东营257015 [4]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《地质通报》2008年第5期633-640,共8页Geological Bulletin of China

基　　金：国家自然科学基金项目《高蜡凝析油化学组成精细剖析和成因机理研究》(编号：40172056)资助。

摘　　要：根据油气包裹体的特征和盐水包裹体的均一化温度,结合烃源岩生烃史和地层埋藏史,分析了苏北盆地溱潼凹陷断阶带具代表性的油气藏的成藏期次。断阶带内油气富集程度较高,不同构造带或同一构造带不同断阶带油层的分布特征存在明显的差别。油源岩为古近系阜宁组二段和(或)泰州组的油藏具有2期油气充注的特点,如祝庄油田D34井阜宁组三段油层第一期充注的时间为26～21 Ma,第二期开始充注的时间约为12Ma;草舍油田中-南断块S198井阜宁组三段油层第一期充注为14～8Ma,第二期为5～2Ma;草舍油田北断块S120井三垛组一段油藏第一期充注时间为17～4Ma,第二期无法找到对应的成藏时间。而油源岩为阜宁组四段的油藏为一期充注,如角墩子油田S228井三垛组一段、戴南组一段油层开始充注的时间约为14Ma,一直持续至今。Based on the characteristics of hydrocarbon inclusions and homogenization temperatures of saline inclusions, combined with the hydrocarbon-generating history and strata burial history, the formation stages of representative hydrocarbon accumulations in fault terrace belts of the Qintong subbasin, northern Jiangsu basin, were analyzed. The results show that the degree of hydrocarbon concentration in fault terrace belts was high. However, there is significant difference in distribution characteristics of reservoirs in different structural zones or in different fault terrace belts of the same structural zone. Petroleum injection occurred in the two stages in reservoirs whose oil sources were the Second Member of the Furring Formation and/or Taizhou Formation. For example, the first injection of the reservoir in well D34 in the Third Member of Funing Formation of the Zhuzhuang oilfield occurred between 26 and 21 Ma and the second injection began at -12 Ma; the first injection of the reservoir in well S198 in the Third Member of Furring Formation in the south-central fault blocks in the Caoshe oilfield occurred from 14 to 8 Ma and the second injection from 5 to 2 Ma, the firstinjecting of the reservoir in well S120 well in the First Member of the Sanduo Formation in the northern fault blocks in the Caoshe oilfield occurred from 17 to 4 Ma and no corresponding formation time of hydrocarbon accumulations has been found for the second injection. On the other hand, the oil reservoirs whose oil sources were the Fourth Member of the Funing Formation formed by only one stage of oil injection. For example, the oil injection into the reservoirs in the First Member of the Sanduo Formation and the First Member of the Dainan Formation shown by well S228 in the Jiaodunzi oilfield began at 14 Ma and continued till now.

关 键 词：溱潼凹陷 流体包裹体 均一化温度 油气 成藏期次 

分 类 号：P534.611[天文地球—古生物学与地层学] P618.130.2[天文地球—地质学]