基于岩心观察、测井解释及开采数据分析,结合流体包裹体等测试,对马岭—乔川地区长6油层组的油藏分布特征及控制因素开展研究.研究结果表明,研究区油藏纵向上主要分布在长63油层段,长62、长61油层段含油性显著变差;平面上,长63油层段以L125,B452和L411井区为中心,油藏团块状分布,呈两条带沿北西南东向延伸,油层厚度主要在5～20 m之间,长62、长61油层呈孤立土豆疙瘩状分布,分布规模小.长6油层组油藏以岩性油藏为主,包裹体均一温度集中在70～90 ℃,荧光以黄褐色为主,结合区域埋藏史分析显示该区油藏充注为晚侏罗世和中-晚白垩世,表现为早期充注.长6油层组烃源岩厚度、距离,砂体砂质碎屑流砂体性质、物性和叠置类型是其形成油气藏的重要影响因素;长63油层段相比长62和长61油层段具有更靠近烃源岩,砂质碎屑流成因砂体分布广、孔渗条件好、叠置厚层砂体类型发育等优势.研究区最为有利油藏的勘探目标为长63油层段Y470,L374,B452等井区附近,有利勘探区面积达到517.28 km2.
Distribution of oil reservoirs and factors controlling them in Chang-6 oil layer in Maling-Qiaochuan area of Ordos Basin
This study uses observations of the core,interpretation of data from well logging,and the analysis of data on oil production in combination with fluid inclusion testing to examine the characteristics of distribution of and factors controlling oil reservoirs in the Chang-6 oil layer group in the Maling-Qiaochuan area of the Ordos Basin in China.The results showed that oil reservoirs in the area were longitudinally distributed in the Chang-63 oil layer,and the oil contents of the Chang-62 and Chang-61 oil layers had decreased significantly.On the plane,the Chang-6 oil layer was centered around wells L125,B452,and L411,with a block-like distribution and two zones extending in a northwest-southwest-east direction.The thickness of the oil layer ranged from 5 to 20 m,while the Chang-62 and Chang-61 oil layers had a small scale of distribution.The uniform temperature of the inclusions was concentrated at 70～90 ℃,and they had a primarily yellow-brown fluorescence.This information,in conjunction with the analysis of the regional burial history,showed that oil reservoirs in the area had been filled in the Late Jurassic and Middle-Late Cretaceous.The thickness and distance of the source rock as well as the physical properties and forms of stacking of the sand bodies due to sandy debris flow were important factors influencing the formation of oil and gas reservoirs in the Chang-6 oil layer group.Compared with the Chang-62 and Chang-61 layers of oil,the Chang-63 layer had the advantages of being closer to the source rock,having a wider distribution of sand bodies caused by the flow of sandy debris,good porosity and permeability,and thickly stacked sand bodies.We identified 12 suitable areas for the exploration of oil reservoirs for the Chang-63 oil layer,six areas for the Chang-62 layer,and four suitable areas of exploration for the Chang-61 oil layer by considering multiple factors.
Maling-Qiaochuan regionChang-6 oil reservoir groupreservoir distributioncontrol factorsprediction of favorable areas
万方数据
维普
