Comprehensive Study Of Petroleum Geological Conditions In In The Southern Section Of Ciyutuo Slopes

The southern section of the Ciyutuo slope is located in north of Eastern depression in theLiaohe basin, which is slope structural belt retained by fault Cixi and Cidong, and is boundedto fault Cixi and Cidong in the east and west. Its area is60km~2located from the south well19to the north well16. Controled by the tectonic setting, the upper layer is mainly drapeanticline, broken nose and fault block and other structural traps. The lower layer is mainlystructural-lithologic traps, lithologic traps. Since1975, the Ciyutuo slope is drilled. There are41various types of exploratory wells and more than230exploitation wells drilled to the endof December2011. It has already been found industrial oil and gas flow in the Ed, S1and S3member. It has been found many oil and gas blocks in the area like block Ci12,Ci32,Ci22,Ci629, Ci601and so on. The proven geological oil reserve is2499×10~4t that iscumulative reported, natural gas geological reserve is10.28×10~8m~3, and the annual output ofoil is6.2×10~4t.Ciyutuo slope is close to Niuju-Changtan hydrocarbon sag in the east. The sag has thickhydrocarbon source rocks, rich oil source. It is mainly alluvial fan, bet lands and fan deltadepositional system. The thickness of favorable facie belts are large and reservoir propertiesare good. The fault Cidong is the main channel of the hydrocarbon migration and the faultCixi has played a block role in oil accumulation, thus has good oil and gas accumulationconditions. Different structrual parts In he southern section of Ciyutuo slope have a sccatereddistribution of oil wells and complex geological conditions. The systematic study on oil andgas reservoirs in the area is relatively less in the past. There are many factors constrain theprocess of the oil and gas exploration as following: the constrain of the quality of seismic dataand technology, the complex change of inter-well reservoirs, the not clear controlling factorsof oil sandbody distribution and the lack of awareness of oil distribution law.This paper carrys out the comprehensive study on petroleum geological conditions in thesouthern section of the Ciyutuo slopes, and makes full use of geological, geophysical,dynamic and static development data, plays the advantages of multi-disciplinary joint research,uses the basic theory and reasearch analysis of petroleum geology, reservoir geology andstructural geology as a guide, comprehensively utilizes3D seismic fine interpretation, thecoherence analysis of3D seismic facies, seismic inversion with constrained with oil wells andgeological comprehensive evaluation on traps. To predict the unknown area by the knownarea, a full understanding, digestion and analysis of a variety of materials about drilled wells,the fine structural interpretation on regional structural configuration. To analyze and forecaston geometry and thickness changes of different deposition types of reservoir distribution indifferent depositional periods, determine the distribution of favorable reservoir sands,systematicaly study formation conditions and controlling factors of oil and gas accumulation, predict the distribution of oil and gas layer. Ultimately, through comprehensive geologyevaluation of traps, to select the favorable exploration targets and suggest the welldeployment, form the effective way of oil and gas accumulation exploration in this region,and find many Lithologic traps like Ci631and Ci612. Deploy1controlling wells and8development wells.