车西地区湖底扇沉积特征及储集物性
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摘要
湖底扇是车西地区北部陡坡带及洼陷带的一种重要的沉积类型,根据其成因机制上的差异,分为滑塌浊积扇和深水浊积扇两种类型,二者在沉积特征及地震反射特征等方面均有所差异。扇体的储集空间以次生溶孔为主,微裂缝起到重要的连通作用,属中低孔、低渗储层。储层物性受岩性组合、溶蚀作用、沉积相带及异常高压的影响,其中溶蚀作用及异常高压有效地改善了储集物性。勘探实践表明,扇体生、储、盖配置好、油气充满度高,具有较大的勘探价值。
Sublacustrine fan is an important sedimentation type in the steep slope zone and sag zone in the north of Chexi Area. According to the difference of genesis mechanism,it is further divided into the slump turbidite fan and deep-water turbidite fan because they have some differences in the respects of seismic reflection characteristics and depositional characteristics. The reservoir spaces are mainly the secondary dissolved pores,which are connected by microcracks. There are the moderatelow porosity and low permeability in the reservoirs. The reservoir physical property is mainly dominated by lithologic combination,dissolution,sedimentary facies and abnormal pressure,in which the dissolution and abnormal pressure have effectively improved the reservoir physical property. Prospecting practice indicates that there is a good allocation of sourcereservoir-seal assemblage and a high hydrocarbon fullness in the fan bodies,which has a large prospecting value.
Sublacustrine fan is an important sedimentation type in the steep slope zone and sag zone in the north of Chexi Area. According to the difference of genesis mechanism,it is further divided into the slump turbidite fan and deep-water turbidite fan because they have some differences in the respects of seismic reflection characteristics and depositional characteristics. The reservoir spaces are mainly the secondary dissolved pores,which are connected by microcracks. There are the moderatelow porosity and low permeability in the reservoirs. The reservoir physical property is mainly dominated by lithologic combination,dissolution,sedimentary facies and abnormal pressure,in which the dissolution and abnormal pressure have effectively improved the reservoir physical property. Prospecting practice indicates that there is a good allocation of sourcereservoir-seal assemblage and a high hydrocarbon fullness in the fan bodies,which has a large prospecting value.
引文
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[2]饶孟余,钟建华,赵志根,等.浊流沉积研究综述和展望[J].煤田地质与勘探,2004,32(6):1-4.
[3]王秉海,钱凯.胜利油区地质研究与勘探实践[M].东营:石油大学出版社,1992:245-247.
[4]范振峰.车西洼陷北带湖底扇成因机制及其勘探意义[J].新疆石油地质,2007,28(1):48-50.
[5]李丕龙,庞雄奇.陆相断陷盆地隐蔽油气藏形成:以济阳坳陷为例[M].北京:石油工业出版社,2004:61.
[6]许金慧,史桂生,彭海军.渤南一区浊流储层特征[J].断块油气田,2004,11(6):28-30.
[7]许晓明,刘震,谢启超,等.渤海湾盆地济阳坳陷异常高压特征分析[J].石油实验地质,2006,28(4):345-349.
[8]隋风贵.断陷湖盆陡坡带砂砾岩体成藏动力学特征:以东营凹陷为例[J].石油与天然气地质,2003,24(4):335-340.
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