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松辽盆地南部中浅层沉积演化与油气分布
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摘要
松辽盆地南部蕴藏着丰富的油气资源,目前探明储量主要集中在泉三段至嫩江组中浅层储层。本论文是以储层沉积学、石油地质学和油气成藏动力学为理论指导,综合利用地质、地球化学、地球物理和分析化验等资料,开展沉积体系研究及有利储集体相带划分,确定松辽盆地南部中浅层沉积相类型与分布规律,建立沉积演化模式,对不同沉积类型的各相带进行综合评价。结合该区油气成藏主控因素和成藏模式,对有利区域进行预测,从而达到开拓油气勘探新领域的目的。
     根据详细的岩心观察和描述,结合测井资料、区域地质资料及各项分析化验资料等进行综合分析,确定了松辽盆地南部中浅层的沉积体系分布规律,识别出了辫状河、曲流河、末端扇、辫状河扇、三角洲、浅水三角洲、辫状三角洲与滩坝等沉积相类型,同时提出了新的沉积模式与沉积演化规律。泉三段沉积时期,气候环境炎热干燥,主要发育河流-末端扇沉积体系,河流相包括曲流河与辫状河。泉四段沉积时期,研究区内没有统一的汇水中心,同样以河流-末端扇沉积为主,研究区西北部发育辫状河扇-曲流河沉积。青山口组主要发育三角洲沉积和浅水三角洲沉积,砂体主要分布在西部地区,物源主要来自西部、西南部和南部,研究区东部为泥质沉积。姚家组沉积时期,西北部英台-白城水系发育辫状三角洲,西南部通榆-保康水系、南部长春水系发育浅水三角洲沉积。嫩一段和嫩二段主要发育滨—浅湖和半深—深湖沉积,零星分布薄层砂滩砂体。从嫩三段开始到嫩五段,水体逐渐变浅,湖盆范围缩小,北部物源主要发育三角洲沉积,南部缺乏恒定物源注入。
     基于实验室分析资料,研究了松辽盆地南部中浅层储集空间类型,分析了不同沉积相类型各相带和储集岩储集性质的关系,对不同沉积相带的储集体进行了综合评价,确定了有利相带分布范围。研究认为,三角洲前缘水下分流河道与河口砂坝、末端扇分流河道、辫状河扇中部亚相辫状河道、河流相河道亚相储层物性较好。河流相堤岸亚相、浅水三角洲分流河道、三角洲前缘远河道与远砂坝、前缘席状砂、末端扇河道漫溢相储层物性次之。河流相河漫滩、末端扇泥滩沉积与远端盆地、前三角洲及分流间地区储层物性较差。
     采用油气成藏组合观点,在平面、剖面上研究油藏的分布特点,分析了油气的分布与烃源岩分布、有利储集相带分布、油气输导体系等之间的关系,确定了油气分布的主要控制因素,总结了油气分布的规律性认识。松辽盆地南部中浅层油气分布主要受烃源岩分布、储集体分布、有利的生储盖组合配置、有效的圈闭与断层等因素的影响。在区带成藏条件和油气分布控制因素研究的基础上,分析了松辽盆地南部中浅层不同区带的成藏机理,对有利目标区域进行了预测。
There are abundant hydrocarbon resources in the south of Songliao Basin. The proven reserves mainly concentrate in the middle-shallow layer of the third member of Quantou formation to Nenjiang formation at present. This thesis is on the instruction of reservoir sedimentology, petroleum geology and hydrocarbon accumulation dynamics. Setting up the rearch of sedimentary system and classify of profitable facies belt in middle-shallow layer in the south of Songliao Basin using geology, geochemistry, geophysics and analyzed assay datum. To establish the sedimentary facies type and it’s distribution pattern, and sedimentary evolution mode. Evaluate each facies belts of different sedimentary facies comprehensively. Predict the range of profitability combine with the master factors of hydrocarbon accumulation and accumulation mode of Middle-shallow layer in the south of Songliao Basin. So obtain the object to uncover the new region of exploration activity.
     According to the detailed observation and description of core, progress the synthesized analysis by combinbing the well logging, data of areal geology and all kinds of analyzed assay datum, assured the distribution regular pattern of sedimentary system in this area. Braided river, meandering river, terminal fan, braided river fan, delta, shallow delta, braided delta and beach bar sedimentation types are identified, and bring forward the new sedimentary mode and Sedimentary evolution regular. The climate is heat and arid in the third member of Quantou formation, and river-terminal fan sedimentary system develops in this period. There is no unitary water catchment center in the fourth member of Quantou formation, river-terminal fan sediment is the major sedimentation type, braided river fan-meandering river develops in the northwest of research area. Delta and shallow delta develops in the Qingshankou formation. The sand body distributes in the western area, the provenance come from the west, southwest and south of the research area, the east is muddy sediment. The braided delta develops in the northwestern Yingtai-Baicheng water system in Yaojia formation,and shallow delta develops in the southwestern Tongyu-Baokang water system and southern Changchun water system. The shore-shallow lake and hemi-deep-deep lake develop in the first and second member of Nenjiang formation, and thin bed beach sands distribute fragmentarily. The water body becomes shallow and the lake basin reduces from the third member of Nenjiang formation to the fifth member of Nenjiang formation, delta develops from the north provenance, and the constant provenance absent from the south provenance.
     The reservoir types in the middle-shallow layer in the south of Songliao Basin are studied based on the analytical data from the laboratory, and the relation between facies belts and reservoir characters of different sedimentary facies are analyzed. The reservoir of different facies belt are evaluated, and profitable facies belts are defined. The result shows that the reservoir quality of underwater distributary channel and channel mouth bar of delta front, distributary channel of terminal fan, braided channel of middle braided river fan and the channel of river facies are well. The reservoir quality of bank of river facies, distributary channel of shallow delta, distal bar and distal channel of delta front, sand sheet, overbank of terminal fan take second place. The reservoir quality of flood plain of river facies, mud flat and distal basin of terminal fan, predelta and interchannel area are bad.
     Take the point of hydrocarbon accumulation association to study the planar and sectional distribution pattern of petroleum reservoir. The relation between petroleum distribution and sources rocks distribution, profitable facies belt, petroleum dredge system and so on. Summary the regularity recognition of petroleum distribution. The petroleum distribution in the middle-shallow layer in the south of Songliao Basin is under the control of sources rocks distribution, accumulate facies belt, profitable association of source rock, reservoir and cap, effective trapping and fault and so on. The hydrocarbon accumulation mechanism is analyzed in different belt of the middle-shallow layer in the south of Songliao Basin on the base of research of hydrocarbon accumulation and petroleum distribution, and predict the range of profitability.
引文
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