Tang Nan Tableland Ordovician Platform Margin Belt Features And Geological Conditions On Structures In Tarim Basin Tang Gu Depression

Uplift of north of Bachu uplift and tower in Tang Gu depression, and Mengaiti tothe South and west slope and Southeast depression is the transition relation.Narrowingof central North convex, something that ends in Tang Gu depression, the plane was"fan", an area of about63000km2. Oil and gas exploration tanggubazi depressionmainly in the Qianshan, for years without a break.Tang Nan1well is the first port in Tang Gu area Ordovician LianglitageFormation of reef flat for the purpose layer risk exploration.The well see50.86m/13layer gas survey in Lianglitage Formation in Yingshan formation, see2m/1layer ofgas logging display, display of the region in the new exploration field.Through thestudy on the borehole lithology, electrical, sheet and paleontology, OrdovicianLianglitage Formation that platform margin reefs and development, is the thickness oftower, Bachu more than2times, the reef beach bodies mainly developed in the lower4good, good in5segments; in the absence of Ordovician Tumuxiuke formation, aroom group, there is the unconformity between the Lianglitage Formation andYingshan formation, the development of karst weathering crust..Tang Gu depressioneffective hydrocarbon source rocks are the middle lower Ordovician source rocks, thetectonic characteristics of Tang Nan border zone, distribution and the favorablereservoir development areas, through the analysis of oil and gas into the reservoirgeological conditions, the favorable exploration, laying the foundation for future oiland gas exploration.1, We further make clear the formation. The wells drilled strata from top tobottom in turn off of Cenozoic Quaternary, Neogene, Paleogene; Triassic; the upperpaleosoic Permian aqia group, Carboniferous Xiaohaizi formation, Cara group andBachu group; Lower Paleozoic Ordovician Sangtamu formation, LianglitageFormation and Yingshan formation (not wear). Lack of Mesozoic Cretaceous, Jurassic, upper Palaeozoic Devonian and lower Paleozoic silurian.2, Tang Nan1well confirmed the body the reef beach Tang Nantai border zone.Good2segment development platform margin shoal, open platform facies, openplatform facies to yield4low-energy Bioclast beach, good for5segmentdevelopment platform margin shoal facies, with high-energy oolitic beach facies;formation and development in the shoal.3, The development of Ordovician reservoir pond Nantai border zone. Objectivelayer of the upper Ordovician Lianglitage Formation core7, core serious broken,small joints and micro fracture growth. Interpretation of reservoir LianglitageFormation reservoir porosity logging87.0m, a maximum of9.6%, well logginginterpretation of porosity weighted average of1.8%, show that the LianglitageFormation of lower part of reef flat reservoir physical properties excellent local.4, The area had a wide range of oil and gas accumulation process, the reservoirbitumen and hydrocarbon inclusions were found in rich Ordovician LianglitageFormation and Yingshan formation reservoir, combined with the evolution history ofhydrocarbon source rocks inferred the hydrocarbon mainly Cambrian source rockcontribution.5, Tang Nan border zone of the south is the advantageous direction ofhydrocarbon migration and accumulation and adjustment.