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Sequence Stratum Analysis Of Part Of YaoJia Group In The YingTai Area Songliao Basin

Posted on:2010-12-23Degree:MasterType:Thesis
Country:ChinaCandidate:H W YuanFull Text:PDF
GTID:2120360272988087Subject:Geological Engineering
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YingTai area is situated in the north of SongLiao basin, a high structual places surrounding this districts ,and in the middle of which is Gulong syncline.First member of the YaoJia formation is a stratum of Late Cretaceous,and it belongs to PuTaohua oil-deposits.The sequence strata of first member of the YaoJia formation is analysed and the prospective of oil&gas is evaluated,the intresting districts are predicted under guidance of sequence stratigraphy, seismic stratigraphy and modern sedimentology, comprehensivly ultilize seismic data ,well logging data and log data ,in the combination of achievements of forerunners. This paper identify three parasequencesets(P11, P12, P13)and nine paraseqnences,establishing sequence-stratigraphic framework of first member of the YaoJia formation through analysing the reflection characteristic of seismic profiles and combining well-logging data and log data.On the basis of analysising well facies and seismic facies,we ascertain that the region is mainly delta front subfacies,which can be further devided into five kinds of sedimentary microfacies: river distributary channel, channel bar,distal bar,front sheet sand and coastal shallow lake.Sedimentary facies are controlled by western source and eastern Daqing Changyuan source.We also sum up the key factors and the laws that effect and control the gathering of oil&gas by using the detection results of hydrocarbon and the prediction results of effective thickness of sandstone,and through the prediction of intresting traps. Sandstone is much developed at the western region, the sandstone content is higher than 50% and it belongs to the assemblage that sand wrapes mud, and the thickness of regional cap rock is only 5~7m, so it is difficult to gather the oil&gas effectively.The sandstone content is between 15%~35% at the southeast district,which forms the assemblage that mud wrapes sand, and it is suitable for forming the lithologic reservoir and has better source rock,so it is an advantageous region of prospecting.
Keywords/Search Tags:Sequence stratigraphy, Sedimentary facies, Prospective evaluation of oil&gas, SongLiao basin, First member of the YaoJia formation
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