Fine Structure Elucidation And Reservoir Horizontal Predication Of The Shahejie Formation Of Tangjiahe Structure

Mainly research Shahejie Formation of Tangjiahe structure in the Dagang Oilfield in the paper. To proceed the in depth study in Shahejie Formation of Tangjiahe structural features and the reservoir distribution features, these means are used ,which are the basic theory and means of the structural geology, petroleum geology, seismic exploration and well logging, and to interpret the layers and the seismic data; At the same time, to make good use of the means of the research of the logging reservoir , the wave impedance inversion and the electrical resistivity random statistics inversion . In the article, the technique difficulties are that there is no steady mudstone bed or the oil shale bed to resolve the logging standardization problem and that many oil beds are thinner, even less than five meters to resolve the thinner beds problems. To resolve the logging standardization problem, the one or some key wells are selected and the greater bed thicknesses in the plane distribute steadily are selected in the oil field. Using the seismic wave impedance inversion and the statistics inversion inversing, the thin reservoir bed problems are resolved, and the along track resolution access some meters.The outcomes are acquire by the article development.(l)to establish the fit Tangjiahe district the logging standardization ways. By the histogram move evenly ways to calibrate the acoustic wave curves and the deep investigation resistivity log curves. Drawing the key wells acoustic wave time differences and the deep investigation resistivity frequency histograms, the key bed acoustic wave timedifference value is 290/μs/m and the deep investigation resistivity value is 3.0Ω·m.Others compare the key well and to define the calibrate value.(2) By the fine structure elucidation, multiwell seismic synthetic records are completed, improving the velocity awareness, completing the velocity demarcate accurately, establishing the velocity pattern in all districts. During the article, basic on the composite recording theories and the means and the Tangjiahe oil field lie in the fault development districts, where the formation lithology exist difference features. In the districts many straight holes and inclined wells synthetics earthquake record. Seismic data were fine demarcated, and the velocity patterns were established in all districts. All the velocities are unanimous compare with Huabei district. (3)By the stratigraphic position model building, 3D geology pattern and the low frequency geology pattern are established in Tangjiahe district. Basic on the seismic data fine structure elucidations, the deposit geologic characteristic pattern are established. Main oil-bearing horizon Banqiao ,BinI BinII, BinIII interpretation stratigraphic positions and the fault interpretation data are selected to limit. In the 3D ,to establish align stratigraphic positions and stratigraphic positions , stratigraphic positions and faults, faults and faults intercept relationships; To establish align geology regular patterns; Combine with the logging data ,passing the interpolation to establish align geology regular patterns low frequency geology patterns.(4) Combine with the two inversion ways, the thinner reservoir identify problems are resolved .During the wave impedance inversion, the great oiliness sand bodies are depicted, but the small oiliness sand bodies can not. So basic on the geostatistics random pattern inversion ways were used to depict the sand bodies features.By the article research, the six stratigraphic positions are interpreted, structure graphs are five layers, depict the main faults are 25 twigs and depict the oiliness sand bodies 12. Using the high capacity reservoir to trace the high capacity reservoir, define the distribution ranges and the thickness of the oil-bearing sand body. The high production oil layers are traced, and define the oiliness sand bodies' distributions and the thicknesses. Completed the trace sand body at present, the whole development effectiveness are well, which to offer the direction in well network regulations and the roll increase reserves.