The Discrimination Of Palaeozoic Tensional Normal Faults And Their Geological Significance For Petroleum In Tarim Basin

More than 60% oil and gas traps had been found in Tarim Basin fault zone, thesetraps are closely related to faults. The identification and evolution of fracture isimportant element and content. There are few studies about palaeozoic tensionalnormal fault of in Tarim Basin. Therefore,the study for the identification of thesefaults and their relationship with oil and gas systems is very necessary.Guided by the theory of plate tectonics ,this thesis using the existing regionalgeological, geophysical, drilling, seismic, formation data as the base. Using seismicinterpretation technology identify the Paleozoic tensional normal fault to analyze theprofile characteristics, planar distribution of these fault. On this basis, analyzing theinfluence of tensional normal faults to Paleozoic sediment and anaphase faults.Combining with research production of predecessor about the evolution of oil and gasis to investigate the relationship between Paleozoic tensional fractures andhydrocarbons .Made the following main conclusions:(1) Applying comprehensive method for identifying tensional normal fault , thisthesis identified more than 50 palaeozoic tensional normal faults for the first time inthe Tarim basin(2) Today,the normal faults who keeping the early conformation often brokendown into the basement, only break up into Cambrian strata, or Ordovician strata. Theactive time of these faults is early Caledonian movement ,who was not influenced byLater tectonic movement. but if these faults break up into Ordovician strata,theywould be influenced by late Caledonian and Hercynian tectonic movement. some ofthese fault kept activities until Himalayan. Overall, the palaeozoic tensional normalfaults who kept activities after early Caledonian movement most changed into thrustfault reversed.(3) Early Paleozoic tensional normal fault mainly in the three ancient uplift: Tabei,Tazhong and Bachu uplift is relevant to the Seismic Data of three ancient upliftrelative wealth than other regions, but throughout the entire basin of the 23 regionallarge section , this three paleouplift normal faults are relatively high too. Overall,early Paleozoic basin development of a series of major NW, NNW and WNW tensionfaults, it just proved that there was NE - SW direction of tensile stress in Caledonianearly in Tarim Basin.(4) The late Paleozoic extension fracture is much less in the early Paleozoic,tarim basin only scattered,they only sporadically distributed in tarim basin.In顺托国勒area,there has a series of smaller piece of externtion fault.It should be pointed outthat, some faults are thrust faults in late hercynian, but extend open on state。This kindof faults, I also put it into externtion fracture.Overall, the faults in north west from thesouth east,It shows that there is pull stress from north east to south west In latehercynian of tarim basin.It should be pointed out that,the faults of the late Paleozoicare developed.In the early Permian,Due to the fault of the open,there are many timesBasalt eruption along with this externtion faults.(5) I think that Luntai fault, akkum fault, Akekule fault, Aiding Xi 2 fault, TowerI fault, tower, towerⅡfault, tower 10 wells fault, tower 22 fault, Tangbei fault,Serikbuya fault, Contador Kumu fault, Antique Hill fault, Mazhatage fault, Kalashayifault, Contador Kumu fault,Tumxuk fault, etc. All of these faults are early Paleozoicexterntion fault.Serikbuya fault,Mazhatage fault and Kalashayi fault are externtionfault until the early Permian.The Tumxuk fault is Inverse fault morphology in thePeriod of the early Permian,but Extension open on state,so also called externtion fault.(6) Early Paleozoic externtion faults have a Control to the corresponding periodand late sedimentary formation.It is not only the foundation of evolution in faults butalso the rudiment of fault tectonic belt today.Paleozoic externtion fault affected latelocal structure and the form of trap,they can be used as hydrocarbon migrationchannels. Early Permian volcanic rock which eruption along with this Paleozoicexterntion faults have destroied The formation of the reservoir.