The Analysis Of Hydrocarbon Accumulation Conditions In The 4th Of Buried Hill Of Nanpu Depression

This thesis studied the 4th of buried hill of Nanpu depression by using theories and approaches in petroleum geology,sedimentology,structural geology and other theoretical approaches.Combing with the results of previous studies and making use of analysis datas such as seismology,geology,drilling and well logging information,core data,the research was carried out on the evolution of buried hill,reservoir distribution and conditions of oil source.And then the favorable exploration target was optimum seekinged.The main achievements obtained in this paper are listed as follows:1.The formation and evolution of buried hill shows that the buried hill experienced several stages including Caledonian event,the early deposition of the Hercynian,tectonic reworking of Indo-Chinese epoch,rift transformation of yanshan period,faulted transformation of the Himalayan period,which is determined by combining with regional geological research.The structural evolution have the characteristics of "rise early,then buried and stable".2.The reservoir type is defined as fracture reservoir,The reservoir of 4th buried hill of Nanpu depression is mainly controlled by rock weathering,tectonic movement and cavity filling.According to the evaluation standard of fracture type reservoir and combining with the well logging interpretation,the reservoir was delimited to II type.On this basis,the reservoir is analyzed and predicted by synthetic analysis of seismic multi-attribute.3.The Archean granite and Shahejie mudstone make up of reservo ir-caprock association,forming a good reservoir-seal assemblage.Good relationship was build in gas source term,reservoir term,preserve term and spatial collocation as well,which are benefit for the accumulation.Oil and gas along the buried hill unconformity surface and fault migrating to the buried hill traps to form Paleo-storage of newborn oil/gas.4.Favorable target is optimized on the basis of the analysis study on the oil and gas accumulation conditionswith the adjacent Archean buried hill,The 4th buried hill is therefore a prospective frontier and has quantities of potential resources.