Fine Interpretation Of The Structure And Hydrocarbon Migration And Accumulaiton Of Baka Oil Field

The development of cracks,whose characteristics is different from the otherreservoirs in domestic, that lead to little experience. At present, exploration anddevelopment of the wells in this areas mostly were positioned in the core of theanticlinal fold, the reason why production perfonnance is that there is a deviationabout underground traps and hydrocarbon accumulation rule, oil and gas explorationrisk always exist. Aim at those questions, based on the former research content,combined with the study area geological background,this paper making full use ofseismic logging and drilling geological data, using landmark workstation tosystematical analysis tectonic evolution laws and structural feature and analysiseresearch area seismic facies distributional characteristics by attribute extractivetechnology. And on that basis,we analysis tight gas of key reservoir-forming factorsand gas reservoir forming patterns, combined with work area reservoir sand body infavorable sedimentary environment of distribution and favorable reservoir physicalproperty characteristics, predicted favorable reservoir area in order to developmentplan programming. The result proves that:(1) The research area has experienced two big tectonic movements, and theexisting constructed prototype has formed during the yanshan movement. Meanwhile,the most intense tectonic movement of Tuha Bas，himalayan movement, reconstructedthe old structure to a new one. This area developed two tectonic styles,basement-involved tectonic style and cover-slipping tectonic style. It was fracture thatcontrolled the reservoir formation, two kinds of fracture types that has developed inthe cover-slipping tectonic style, and they cooperated with each other and linked upgas source with structural traps.(2)We can acquire the sedimentation information of tight sand:BadaowanFormation2section develops braided river delta plan facies,at that time,floodingstage, the hign water level caused poor sediments provision; when Badaowan1section deposited, the water level went down. sediments carried forward to thelake.caused relatively high sediments provision, at this time, the lake suppression tage,braided river delta plan facies was also developed,lacustrine facies only limited in central and southern parts of the research area.(3) Considering the structure and fracture development characteristicsedimen-tary evolution characteristics and evolutionary process of sedimentary facies,etc. wedivided the hydrocarbon reservoir into fault anticline,fault block,lithological andfault-lithological type resvoir.(4)Through deeply analysising tight gas feature, we can clearly find out theconditions of source rocks,the reservoirs and the covers, and the keyreservoir-forming factors, then,the summary obtains:1) The goal gas source rocks ismaterial foundation of the tight gas;2) The whole work area is oil-generatedreservoirs,which becomes the favorable place for resvoir;3) The structure fracturecontrols the tight gas move together.