High-resolution Sequence Stratigraphy Research On The SⅡ～PⅠ Reservoirs Of The Twelve-section In Xingnan Region

Based on the recent theories and methods of high resolution Sequence Stratigraphy, Sedimentology, Seismic Stratigraphy and Biostratigraphy, and using seism, well logging and core information,The auther analyzes and researchs the high sequence formation framework, sedimentary facies,distribution rule of sand-body and evolution rule of the lake strandline in the region of interest . The results will offer the positive purpose for exploration and development of the remaining oil in the intermediary and later stage of the oil field, the optimise of the designation block and the definition of target strata .The target strata of the studied area are Sâ…¡, Sâ…¢and Pâ… oil layers. On the basis of the predecessors, research results, the target strata grows the third-order sequence Xâ…¢and Xâ… V. The P17-14 sublayer is a part of the third-order sequence Xâ…¢,and the P13~S21 sublayer attributes to the third-order sequence Xâ… V. Research in this project at all levels in accordance with the sequence of interface markers identified 2 long-term base-level cycles LSC1 and LSC2; 3 medium-term base-level cycles MSC1, MSC2 and MSC3; 72 short-term base-level cycles.On the basis of the high-resolution sequence stratigraphic framework to be established,applying to the new theories ,new conception and new methods of the contemporary sedimentology, The auther observes and describes the drilling cores of the coring well X12-3-J3222 and X8-30-J337,Combining the logging and seismic data , identifying two typies of sedimentary facies,four typies of sedimentary subfacies and twelve sedimentary microfacies in target strata of the studying area.On the same time,the auther furtherly analyzes and studies the growing feature and distributing regularity on the all kinds of sedimentary facies,and acquires new recognition. In the course of the research to the sedimentary system ,the auther initially analyzes the location and the evolution rule of the lakestrandline,and then probes into the oil(gas) feature nearby the lakestandline to acquire the recognition to the sand body nearby the lakestandline having the well condition to move and save the oil(gas)Under the guidance of the base-level principle and the principle of facies differentiation of the high-resolution sequence stratigraphy, through the chang of A/S values, the deposition of sand body types and growing features of all facies are studied,and the relationship between them and the remaining oil (gas) is analyzed to acquire the new understanding.