Study On Sequence Stratigraphy Of Deep Order Of Paleo-central Uplift Belt

Based on a mass of previous achievements, the thesis has studied the stratigraphic framework of the strata in the paleo-central uplift belt fault depression with the fundamental principle and methods of sequence stratigraphy, combining modern geophysical theory and tectonic theory, and has got some elementary conclusions.On the basis of carefully analyzing and referring the research fruits, by means of the study on the seismic data, logging data and drilling data, the author divides the target strata into four super-sequence. It is believed that the interface of each Formation of the deep strata in the studied area is a super-sequence boundary, and accordingly each Formation forms a super-sequence. Meanwhile it is also deemed that the strata of Denglouku Formation in studied area developed Deng-2 Segment, Deng-3 Segment and Deng-4 Segment, and according to the characteristics of their boundaries, the strata of Denglouku Formation can be further divided into three sequences. Based on the above cognitions, an isochronous stratigraphic framework of the deep strata in studied area is built by means of tracing and correlating the well-tie seismic sections and of combining the well data and seismic data.Through the analysis of the sequence controlling factors such as tectonic subsidence, climate change, supply of sediments and lake level change, this paper clarifies the influences of the above various controlling factors on the development of sequences. It is deemed that the structural subsidence is the main factor of controlling the development of stratigraphic sequence during the faulting stage, while the climate change is the leading factor of controlling the development of stratigraphic sequence during the depression period.On the premise of analyzing the evolution of sedimentary facies and sedimentary environment for the strata of Denglouku Formation inside the isochronous stratigraphic framework, this paper predicts the distribution of reservoir for each segment of Deng-3 and Deng-4. Formation strata by using various geophysical attributes. As a result, it is concluded that the types of sedimentary facies of Denglouku Formation are dominated by fluvial facies, and moreover, the fan-delta deposition can also seen in the stratum of Deng-2 Segment. Meanwhile, it is also pointed out that the channel sandbody of Deng-3 and Deng-4 are the most type of reservoir in the studied area.Study by the fact that the unconformity touches relation's to everywhere between the tier , Identifing onlap point and onlap range on the seismic profile. Folding structural contour ,fringe , stratigraphic overlap line and fault plane according to intersection of them is surpassed covering a circle shutting a flat surface distributing picture. At last, the favorable exploration zones in the studied area are pointed out by making an integrative consideration of various ingredients such as source rocks, reservoir rocks, cap rocks and traps.