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The Three Main Paleohigh's Evolution And Affection Hydrocarbon Accumulation, Tarim Basin

Posted on:2010-05-13Degree:DoctorType:Dissertation
Country:ChinaCandidate:K LiFull Text:PDF
GTID:1100360278960666Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
By taking multi-discipline as the guideline, using methods of structural geometry,balanced section evolution,denudation reversion and taking the predecessor progress,l og-seismic material and chemical analyses as the foundation, the paper took the three paleo-high's(Shaya,Katake,Bachu) evolution as the main thread. Then the paper analyzed the paleohighs'tectonic intensity,evolution difference,petroleum-geologic condition and hydrocarbon accumulation pattern, probe into the relation between paleohighs'evolution and hydrocarbon accumulation.First, according the basin's area geologic background and basin's kinetics, the dissertation analyzed basin's distributing character in horizontal and vertical. Then summed up three ordinary overriding relation and seven types of overriding.Second, according to the kinetics of evolution character, the paper further divided the paleo-high of Tarim into four types, then parsed tectonic character of Shaya relic paleo-high,Katake stable paleohigh and Bachu active paleohigh. By comparing tectonic framework,distribution of unconformity,main fault evolution,local formation horizontal and vertical distribution character, the paper summed up the palohighs'tectonic variation in time and distribution rule. Meanwhile, the paper also interpreted the early extensional faulting system and pointed the location of Kuman aulacogen's border fault precisely. Still, the paper also probed the base down fault's influence on later sedimentary evolution.By researching the five main basin prototype stages(paleo-thetis cratogene andpassive continental margin,foreland basin-thetis,p aleo-thetis opening cycle,new thetis opening cycle,multi-foreland basin)during the tectonic movement and knowing those tectonic characters, the paper defined the main period of tectonic variation and identified the main unconformities'composing pattern. With the theory of balanced section,tendency thickness and marker bed~thickness, the paper proposed the theories of decomposing denudation and paleo-tectonic recovering technology, then reconstructed the denudating character of O2 + 3,S,T,K in different periods. Finally, the paper probed the paleo-tectonic evolution of T70,T 74 unconformities'framework during each tectonic period. Combining with all works above, the paper compared the tectonic character and their evolution of three main paleohigh and defined epochs of their developing-reforming-stereotyping. By probing the paleohigh's developing mechanism and melting the dynamic procedure of paleohighs in Tarim basin, the paper constructed the paleohighs'tectonic evolution model.At last, the paper compared the relations between three paleohighs'tectonic evolution and hydrocarbon accumulation which is multiphase,layered and plurimodism. Especially ,the paper discussed the paleohighs'shape during critical period and their influence on hydrocarbon accumulation and distribution. Then defined the hydrocarbon accumulation of paleohighs:①The paleohigh's frame work controlled the source rock's development and evolution of heat;②The paleohighs'distribution controlled the reservoir rock development and reformation;③T he paleohighs'development controlled the conduction system and migration direction;④T he paleohighs'development controlled the trap's type;⑤The paleohighs'reforming controlled the hydrocarbon accumulation periods. At the foundation of all above, the paper first concluded that the paleohighs'"resource rock controlling area,r eservoir rock controlling stratigraphic position,uplift controlled available belt,fracture and unconformity controlled accumulation location". Aiming at the overlapping of different prototype basin, the paper regarded the hydrocarbon accumulation model as six basic types. By taking Lunnan-Tahe huge oil-gas concentration area as example, the dissertation figured out the best arrangement pattern.
Keywords/Search Tags:Tarim basin, Paleohigh, Tectonic evolution, Paleo tectonic, Hydrocarbon accumulation pattern, Hydrocarbon accumulation manpulation system
PDF Full Text Request
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