川黔桂二叠系层序地层与油气勘探

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川黔桂二叠纪的5种不同类型盆地有不同的层序充填,因此,其油气前景也不相同。总体而言,海侵体系域、凝缩层、台盆和盆地的高水位、低水位体系域以及混合台地和孤台高水位体系域上部含煤岩系是重要的烃源层。上述层序也是重要盖区,其中以海侵体系域最为重要。有利储集体及相应的潜在圈闭主要包括:(1)低水位体系域中盆底扇-斜坡扇砂体、三角洲前缘砂体、冲积扇砂体、河道充填砂体、进积复合砂体、丘滩礁组合、钙屑及混屑浊积岩等;(2)海侵体系域中的障壁滩砂体、滨岸砂体、河口湾砂体、潮控三角洲砂体、扇三角洲砂体、浊积扇砂体、滞留型陆棚砂体、海侵型生物丘礁组合、火山碎屑浊积岩等;(3)高水位体系域中的河控、浪控三角洲砂体、冲积扇-河道砂体、扇三角洲砂体、浊积扇砂体、陆屑滩坝砂体、碳酸盐滩坝砂体、丘滩礁组合、钙屑重力流沉积、白云岩等;(4)与界面有关的古岩溶储集体 The five different types of basins in the Permian of Sichuan, Guizhou and Guangxi have different sequences of filling. Therefore, their oil and gas prospects are also different. In general, the high water level and low water level system tracts in the transgressive system tract, condensed layers, basin and basin, and the coal-bearing rocks in the upper part of the mixed platform and the high -stand system tract of the solitary platform are important hydrocarbon source layers. The above sequence is also an important cap area, of which the transgressive system tract is the most important. The favorable reservoirs and corresponding potential traps mainly include: (1) the basin-bottom fan-ramp fan sand bodies, delta front sand bodies, alluvial fan sand bodies, channel sand bodies and sedimentary sand bodies , The combination of rhythm and reef, calcium and turbidite, etc. (2) Barrier beach body, shore sand body, estuary sand body, tidal delta body and fan delta body in the transgressive system tract , Turbidite fan sand bodies, retention type continental shelf sand bodies, transgressive bio-mound reef assemblages and volcaniclastic turbidite, etc .; (3) river control and wave-controlled delta sand bodies in alluvial system tract, alluvial fans - fluvial sand bodies, fan delta bodies, turbidite fan bodies, continental litter bar bodies, carbonate dam bodies, combination of rower and reefs, calcium flux gravity flow deposits, dolomites, etc .; (4) Interface related paleokarst reservoirs
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