【作者】 鹿洪友；

【导师】 肖贤明；

【作者基本信息】 中国科学院研究生院（广州地球化学研究所） ， 地球化学， 2003， 博士

【摘要】 埕岛油田东斜坡区位于埕北低隆起的东南部，是在前第三纪潜山背景上发展起来的披露构造，含有丰富的油气资源，长期以来，对该区成藏条件与成藏模式认识不清。本研究以钻井取心分析资料、测井数据、地震资料为基础，综合利用沉积学、层序地层学、石油地质学、地球物理学、有机地球化学等多门学科的有关理论和研究方法，通过对埕岛东斜坡区油气藏形成条件和模式研究，主要取得了以下几个方面成果和认识： （1）埕岛东斜坡地区下第三系共划分两个层序、七个体系域，其中沙一段至东三段中下部沉积为层序Ⅰ，东三段上部至东一段为层序Ⅱ。 （2）埕岛东斜坡地区东三段至沙一段的沉积砂体成岩作用阶段基本已进入晚成岩A、B期。油气储层的储集空间以原生孔隙、次生溶解孔隙为主，主要为中孔中渗储层。 （3）埕岛油田主要存在三类原油，发育三类烃源岩。油源对比结果表明东斜坡带东营组原油来源于渤中凹陷ED₂暗色泥岩，斜坡潜山带原油来源于渤中凹陷ES₃或ES₁生油岩。 （4）渤中凹陷斜坡带ES₃与ED₂烃源岩主生油期出现在9MY—现在，成烃期与东斜坡区圈闭期在时空上相匹配，加之有良好的运移通道，是东斜坡区主要的油源区。 （5）埕岛东斜坡带砂岩储层发育石油包裹体与盐水包裹体。与石油包裹体共生盐水包裹体均一温度107-141℃，结合受热史推断出成藏时间在2.5MY以后。 （6）建立起了以岩性尖灭、不整合遮挡和超覆尖灭等岩性油气藏为主的成藏模式，预测重点目标区三个，总资源量为1200x10⁴吨。 本研究成果不仅为隐蔽性油气藏研究提供了实例，而且对该区油气勘探具有重要指导作用。更多还原

【Abstract】 The East Slope Area of the Chengdao Oilfield is located at the eastern-south part of the Chengbei Lowuplift. It is a covered structure evoluted from the pre-Tertiary Chengdao Hidden Hill, with rich petroleum resources. There have been many questions about the petroleum pool formation conditions and models for this area since the first well was drilled in 1988, which has had an great influence on the further petroleum exploration and development. In this study, a method with the combination of petroleum geology, sequence stratigrapy, organic geochemistry and geophysics, based on drilled core analysis data, well data and seismic sections, has been applied to investigate the petroleum pool formation conditions and models in this area , and the following results and recognition have been obtained:(1). The Lower Tertiary strata are subdivided into two sequences and seven systems. The strata of ES, to middle ED3 belong to Sequence I and upper ED3 to ED, to Sequence II.(2). The diagenesis of the ED3 and ES, sandstone has been evoluted to late diagenesis A and B stage, with mainly primary pores and secondary solved pores. Most of the sandstones belong to middle porosity and middle permeability reservoirs.(3). There are three types of crude oils in the East Slope Area and three sets of source rocks in the Bozhong Depression. Oil-source correlation analysis has shown that the oils were mostly from ED2 source rocks from the Bozhong Depression, and the oils occurred in the Slope Hidden Hill Belt were from ES3 or/and ES, source rocks in the Bozhong Depression.(4). The main stage of oil generation of the source rocks occurred during 9 my to present, which can match with trap formation in the East Slope Area. With the combination of good migration conditions, it has been believed that the slope area of the Bozhong Depression is the main source area.(5). There are two types of fluid inclusions: petroleum inclusions and aqueous inclusions in the reservoir sandstones. The homogenization temperatures of the aqueous inclusions associated with petroleum inclusions range from 107 to 141 . According to the burial history of this area, it has been deduced the petroleum pools formed after 2.5 My.(6) Three petroleum pool formation models have been established and three important targetting areas have been evaluated, with total petroleum resources of 1200 x 104 ton.These results have not only provided a case study of hidden petroleum pools, but also given an important guide to the exploration evaluation of this area.更多还原