Sequence And Non-structural Traps Analysis Of The Paleogene In The Nanpu Sag

Combined with drilling, logging and seismic data, and other information to Vail sequence stratigraphy theory as a guide, a comprehensive analysis of seismic reflection characteristics, logging wavelet transform spectra, △logR, acoustic logging curve trend line and sedimentary strata unit vertical stacking patterns, four secondary sequences within the Es and Ed identify interface, nine third-sequence boundary in Nanpu Sag, T1 type sequence boundary:Es34, Es32, Es1 s, Ed3 s and Ed1 bottom interface belongs, Es2、Ed2 and Ed1 bottom interface belongs T2-type sequence boundary, Es33、Es31、Es1x、Ed3x bottom interface belongs T3 type sequence boundary. T3-type sequence boundaries are developed both up and down sand can block the formation of unconformity traps and stratigraphic traps covered. T2 type sequence boundary under general development lake retreat sand interface, the interface is generally above the lake transgression mudstone, can block the formation of unconformity traps.On the basis of sequence boundary identification, the Nanpu sag Paleocene stratigraphic sequence is divided into three sequence groups, respectively Es3 sequence group, Es2-Es1 s sequence groups, Ed sequence groups, and twelve sequences, sequence from bottom to top are Es35 sequence, Es34 sequence,Es33 sequence, Es32 sequence, Es31 sequence, Es2 sequence, Es1 x sequence, Es1 s sequence, Ed3 x sequence, Ed3 s sequence, Ed2 sequence, Ed1 sequence.Es35 sequence, Es33 sequence, Es1 x, Ed3 x sequence can be divided into three domains: LST, TST, HST, Es34 sequence,Es1 s sequence, Ed3 s sequence, Ed1 sequence Ed1 sequence can be divided into two domains: transgressive systems tracts and lake regressive system tracts,Es31 sequence system is divided into four domains: LST,TST,HST and RST,Es2 sequence can be divided into a system domain: TST, there are significant differences configuration or structure of twelve third-order sequences, the rise and development of secondary sequences mainly developed three hierarchical sequence, the sequence of the secondary two of the major developmental decline hierarchical order, the conversion of two sequences can be developed four hierarchical order. By contrast even the well section and seismic wave impedance inversion analysis, sand mainly late in the second hierarchical order, the early and mid- layered sequence of three and four- layered sequence of early and late.According Nanpu Sag Paleocene sequence stratigraphy,sedimentary system development features such as Nanpu Paleocene hidden traps class can be divided into lithological traps, stratigraphic traps and mixed traps. Pour on lithological traps which includes lithological pinch traps, lithological traps lens, river sand traps; stratigraphic traps include stratigraphic traps overlying unconformity traps shelter, buried hill traps; mix closed traps including physical faults-lithological traps, structural- lithological traps, fault- stratigraphic traps. Sedimentation and tectonic action is the key factor in controlling the formation and distribution of subtle traps Paleocene, T3-type layer near the interface of developmental sequence stratigraphic traps and unconformable overlying block traps, development near the T2 sequence boundary unconformity-type block traps near the T1-type layer overlying sequence boundary hidden traps and stratigraphic unconformity traps basically does not block the development.