Research On High Resolution Sequence Stratigraphy And Reservoir Prediction

Tahe oil field is in the Northeast of The Tarim Basin in Sinkiang, The 4th member of Triassic Akekule thin oil sand is one of the most important exploration layers in Tahe oil field, and the layer is just at the beginning of the exploration.The 4th member of Akekule is the main research object in the paper. On the basis of former research, guided by the theory of high-resolution sequence stratigraphy, sedimentology and seismic reservoir prediction technology, combined drilling core, well-logging and seismic data. From point to line to area and well seismic combination research idea, have divided the every well small layer and studied the sedimentary microfacies in 4th member of Akekule; established of the chrono-stratigraphic framework, middle-term cycle sequence framework, the sands are directed into these isochronous stratigraphy framework, research the distribution law of the thin oil sand; studied the best sedimentary facies in the plane by seismic facies and the thickness of sands; at last, prediction reservoir in the emphasis well area by seismic attribute analysis and random seismic inversion.Use the theory of high-resolution sequence stratigraphy to establish a short-term dividing model in the well with coring, finished 82 wells sedimentary cycle divide, have established 1 long-term cycle(LSC1), 4 middle-term cycle(MSC0-MSC3) and 10-12 shot-term cycle, using the middle-term and shot-term cycle sequence framework, the sands are directed into these isochronous stratigraphy framework, and isochronous tracing correlation is set up. Finished research of each cycle sands' plane distributive characteristics: the sands in the MSC1 middle-term cycle grow in the early stage of the half up-cycle, the underwater distributary channel was the main sediments; sands in the MSC2 middle-term cycle grow in the late of the half down-cycle, the beach-bar sands and sheet sands was the main sediments, channel sand grow down; sands in the MSC3 middle-term cycle was mainly growing in the early of the half up-cycle, channel sands sediment.Using the cores and well-logging guide the sedimentary facies research, in the sedimentary cycle, finished the sedimentary research from single well to well-tie to plane, identified two kinds of main maricofacies in research area, including underwater distributive river course and interdistributary bay, the beach bar, estuarine bar and sand of front marginal secondary maricofacies, and finished the plane advantage of sedimentary facies' research.Guided by the advantage of sedimentary facies and sands' distribution characteristic in the middle-term cycle, finished the seismic attribute research in the middle-term cycle, fined the river sands' seismic response characteristics, using the type well, establishing seismic inversion profile, research the oil sands plane distribution characteristic and lengthways thickness distribution characteristic, make the prediction of the oil sands thickness and the advantage of reservoir growth areas.From the high-resolution sequence stratigraphy and high-resolution seismic reservoir prediction combining, can be identified and predicted the thin sands spatial distribution characteristics more effective, make the thin sands spatial distribution subtle recognition and high precision prediction the advantage reservoir come true.