准噶尔盆地西北缘扇体形成演化与扇体油气藏勘探   总被引：27，自引：2，他引：25  

蔚远江  李德生  胡素云  雷振宇  何登发 《地球学报》2007,28(1):62-71

准噶尔盆地西北缘广泛发育二叠纪-侏罗纪冲积扇、水下扇、扇三角洲等砾质粗碎屑沉积,其形成演化严格受不同时期活动的同生断裂控制.二叠纪以乌尔禾组扇体最为发育,呈由盆缘向盆地方向逐渐增强的前展式推覆冲断及渐进式扇体迁移响应模式.三叠纪-侏罗纪以百口泉组、克拉玛依组扇体最为发育,呈由盆内向盆缘方向逐渐减弱的退覆式冲断活动及后退式扇体迁移响应模式.已知扇体油气藏主要富集于水下扇扇根及扇中、扇三角洲平原及前缘4个亚相带,及二叠系佳木河组、乌尔禾组、三叠系百口泉组、克拉玛依组、侏罗系八道湾组、头屯河组6个层位.二叠-三叠纪扇体含油层多、规模大、储量丰度高,侏罗纪扇体反之.受断裂、不整合、岩相岩性、物性4种因素控制,扇体主要形成断块、地层不整合及构造岩性油气藏.断阶带及扇根-扇中相带主要发育构造(断块)油藏,为扇体与断层相配置的垂向运聚成藏模式;斜坡区及扇中-扇缘相带主要发育岩性油藏,为扇体与不整合相配置的侧向运聚成藏模式.西北缘扇体成藏条件好,探明程度总体较低,剩余资源潜力大,进而指出了七大有利勘探区块和方向.  相似文献   

伊犁盆地伊宁凹陷二叠系—侏罗系储层评价与预测     

刘海娟  蒲仁海  钟红利  高山林  邱芳强 《地质科技情报》2011,30(3):83-88

基于露头、钻井、薄片及地震等分析化验资料的综合研究表明,伊宁凹陷二叠系—侏罗系砂岩储层的主要沉积微相类型为冲积扇相和扇三角洲分流河道相、浊积扇相等,粒度整体偏粗,以岩屑和长石溶蚀孔隙为主,二叠系储层属于Ⅲ级储层,三叠系和侏罗系均属于Ⅱ级储层.根据测井约束地震反演得出储层砂岩厚度及孔隙度等值线图反映较厚的有利砂岩储层受凹...  相似文献   

Subsidence Analysis and Burial History of the Late Carboniferous to Early Jurassic Soutpansberg Basin, Limpopo Province, South Africa     

Ntokozo MALAZA  LIU Ken  ZHAO Baojin 《《地质学报》英文版》2016,90(6):2000-2007

The subsidence history of the Soutpansberg Basin was reconstructed by a tectonic subsidence analysis coupled with backstripping calculations based on data of newly interpreted sequence boundaries. Furthermore,burial and time plots were constructed in order to understand the burial and thermal history of the basin. Input data were based on facies,lithostratigraphic models and tectonic interpretations. The studied succession is up to 1000 m and is underlain by the Achaean Limpopo Mobile Belt. The subsidence within the basin supports the primary graben system which must have been centred within the present basins,and later became a region of faulting. The subsidence and burial history curves suggests two phases of rapid subsidence during the Early-Late Permian(300–230 Ma) and Middle Triassic(215–230 Ma). The areas of greater extension subsided more rapidly during these intervals. Two slow subsidence phases are observed during the Late Triassic(215–198 Ma) and Early Jurassic(198–100 Ma). These intervals represent the post-rift thermal subsidence and are interpreted as slow flexural subsidence. Based on these observations on the subsidence curves,it is possible to infer that the first stage of positive inflexion(300 Ma) is therefore recognised as the first stage of the Soutpansberg Basin formation.  相似文献