Study On Sequence Stratigraphy Of Lishu Fault In The East

This paper combines the theory of sequence stratigraphy, petroleum geology,sedimentology, logging, drilling, core and seismic data, using sequence boundary identification, tracking method of the sequence boundary, re division of the Lishu fault depression in the eastern rift structure layer deposition of Huoshiling group J3 h, Shahezi group(K1sh), Yingcheng Group(K1yc), Denglouku formation(K1d) etc. formation and depression depression tectonic layer spring head group(K1q) formation. The study area is divided a spring head group, boarding Denglouku formation and Yingcheng Formation,Shahezi group and Huoshiling group five tectonic sequences, spring head group is divided in the fourth member of the Quantou, spring three segments, spring second period, spring a,Yingcheng Group is divided into camp four, camp three, Shahezi group division of the second member of Shahejie formation, sand a 10 second grade sequence, and the eventual establishment of a Lishu fault depression in the eastern region of Lower Cretaceous sequence stratigraphic framework.The sedimentary characteristics of phase of stratigraphic frame of single well facies,even well facies and plane is investigated, summarized the developed in the study area sedimentary phase of fan delta facies, braided river delta facies, meandering fluvial facies,lacustrine phase, Shahe sub group and Yingcheng Group major sedimentary facies in the fan delta, Deng louku formation mainly deposited the braided river delta phase, springs head group deposited meander river phase, summed up the evolution law of the sedimentary. And in stratigraphic framework of favorable source reservoir assemblage characteristics and Shahezi Formation and Yingcheng Formation are included in the main hydrocarbon source rocks, reservoir of member 1 of spring by the spring section of the second regional caprock sealing, Shahezi Formation oil and gas by Yingcheng Formation mudstone at the bottom local cap layer direct capping. Finally, under the sequence stratigraphic framework, the favorable target selection is summarized under the three models.