Title: Depositional Models and Subtle Trap Exploration under Sequence Stratigraphic Framework in Slope Belt of Continental Lacustrine Depression Basin:An Example as Chunguang Cretaceous Oilfiled in Chepaizi Area,Junggar Basin
Abstract: Base on the case of Cretaceous of Chunguang Oilfiled in Chepaizi area,Junggar Basin,the typical sedimentary models and exploration experience of subtle trap in a sequence stratigraphic framework in continental depression lacustrine basin slope belt was discussed.Combined with sequence stratigraphy theory,we analysed the sequence stratigraphy and sedimentary system in Cretaceous period,meanwhile.According to the petroleum geology theory and sequence style,the reservoir-forming rule and favorable zones was studied.In this paper,a sequence model was built,as well as two sedimentary model,alluvial fan-incised valley-slope fan and braided river delta in sequence framework that respectively belong to LST and ESTHST was put forward.With a sedimentary model of faulted-down basin,the finding is to deem that the sequence stratigraphic framework of the sand body distribution and hydrocarbon accumulation conditions are closely related:During LST-EST stage,incised valley and retrograding delta is to be favorable petroleum plays.If epigenetic fracture system can better match the reservior in the HST peroid,it will also be formed unconformity the stratigraphic reservoirs.In conclusion,the continental depression lacustrine slope belt is believed to be a ideal place that subtle trap could be found in a sequence framework.The key should be focused on the study for unconformity and the fracture,and favorable sand body distribution under a sequence stratigraphic framework also plays a important role.Furthermore,the temporal and spatial matching of oil and gas should be considered further,in this way,the possibility of accumulation is increased.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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