三水地区古近系布心组储层特征及成藏主控因素研究

发布时间：2018-10-08 06:44

【摘要】：通过各类型薄片定量鉴定、岩心核磁共振测试分析、常规压汞测试分析等现代分析化验测试手段,利用研究三水区块的录井、分析化验、取芯、测井等资料,分析该区的沉积特征、岩石学特征、储层特征、物性特征、储层宏观展布特征,烃源岩条件、盖层条件,并结合研究区构造特征进一步分析研究区布心组段油气成藏主控因素,最后总结油气富集规律。研究表明:(1)宝月地区布三段岩性以岩屑长石砂岩和长石岩屑砂岩为主,孔隙度为2.21～16.12%,平均10.66%,主体小于15%,渗透率0.036～595mD,平均74.35mD,主体小于50mD为低-中孔、低-中渗储层,溶蚀作用、胶结作用和压实作用是研究区主要的成岩类型。压实作用较弱,剩余粒间孔保存较多,胶结作用相对较弱,碎屑颗粒被压实、表面次生加大,方解石充填是成岩作用对储层物性影响的主要因素;(2)油藏类型主要为常温常压构造油藏,次为岩性油藏和基岩圈闭油藏。(3)有机质类型:布心组二段以Ⅱ型为主,暗色泥岩中有机碳含量主体介于为0.7%～1.5%。氯仿沥青“A”含量最低为0.011%,最高为0.228%,中值为0.103%。总烃含量为17～1578mg/l,中值643mg/l,Ro值约在0.8%～1.8%之间,达到了好生油岩标准,研究区宝月构造紧邻宝月凹陷生油岩厚值区,沙头圩区块位于小塘凹陷生油岩厚值区,烃源岩条件十分优越。(4)生油凹陷为宝月凹陷、小塘凹陷,相应的构造带内发育较好的圈闭,烃源岩布心组二段在华涌组沉积时期已进人生油窗,而上覆布心组三段的构造圈闭在该时期前或同期已形成,利于捕获油成藏。(5)①“凹中隆”构造为油运移、聚集成藏提供了有利指向;②构造和储层的良好匹配关系为油藏的形成提供了有利条件;③断层侧向封堵对油藏的形成起到了重要控制作用
[Abstract]:By means of modern analytical and testing means, such as quantitative identification of various types of thin slices, core nuclear magnetic resonance test and conventional mercury injection test and analysis, using logging, analysis, coring, logging and other data of Sanshui block, The sedimentary characteristics, petrological characteristics, reservoir characteristics, physical characteristics, macroscopic distribution characteristics of reservoir, source rock conditions, caprock conditions, and the main oil and gas reservoir forming control factors of Buxin formation in the study area are analyzed in combination with the structural characteristics of the study area. Finally, the law of oil and gas enrichment is summarized. The results show that: (1) the lithology of Busan formation in Baoyue area is dominated by lithic feldspathic sandstone and feldspathic sandstone. The porosity is 2.21 ~ 16.12 and the average is 10.66, the main body is less than 15, the permeability is 0.036 ~ 595mD, the average is 74.35mD. Dissolution, cementation and compaction are the main diagenetic types in the study area. The compaction is weak, the remaining intergranular pores are preserved more, the cementation is relatively weak, the clastic particles are compacted, and the surface secondary increases. Calcite filling is the main factor of diagenesis affecting reservoir physical properties, (2) the reservoir type is mainly normal temperature and atmospheric pressure reservoir, the second is lithologic reservoir and the second is bedrock trap reservoir. (3) the type of organic matter: the second stage of Buxin formation is mainly type 鈪，

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