The Study Of Sequence Stratigraphy And Depositional Facies Of Tahe Area South Of Zone A Of Tarim Basin

This study area is located in the northern Tarim basin Tahe region, Ordovicianlayers. Sequence stratigraphy theory at home and abroad of sequence stratigraphy,biostratigraphy, sedimentary facies and reservoir status quo, through a combination oflogging, drilling and well shock, dividing a single well of sequence stratigraphy, andcompared to establish from the region of sequence stratigraphic framework and planardistribution of sedimentary facies. Results of the above analysis, combined with oiland gas accumulation law, to predict the favorable reservoir zone of the study area.Tarim plate in the Ordovician from latitude10o south latitude18o (fangdajun1994), south of the North Kunlun Ocean, north of the southern Tianshan Ocean,southeast of the Altyn small ocean basin, northeast Kuruktag deep-seabasin. Itsinternal existence of two major sedimentary units, namely, the carbonate platform inthe west and east of the shelf basin, among them is a narrow slope with (roughlyCoonan1-full parameter1vicinity). Carbonate platform in the west range is roughlyequivalent to today Tabei Sha Yalong until the tower of the central uplift experiencedthe the tableland growth uplifts white and flooded the demise of the three stages ofdevelopment, the results of the Caledonian movement, transformation, and the Tarimplate closely related to the margin of the interaction between the other block.In this paper, the Ordovician strata from the bottom up is divided into fivelithostratigraphic units, respectively, the the Yozan group (O1-2y), a room group(O2yj,) the Pradesh the Barker groups (O3q), Lianglitage group (O3l), Sangtamu(O3s). Ordovician rock type classification and naming scheme Zeng Yunfu, ChengduUniversity of Xia Wenjie editor of sedimentary petrology textbook recommendedsedimentary rock classification scheme, in the identification of more than2000rockthin, determining the type of rock: volcanic broken scrap material of terrigenoussedimentary rocks, carbonate rocks. Detailed deposition according to the macroscopic description of drilling cores inthe study area23and the microscopic identification of more than2,000pieces ofsheet analysis and sequence stratigraphy of the foundation, combined with thefindings of the9seismic profiles, were identified carbonatefive depositional systemsof the platform, platform margin and platform margin slope and continental shelfbetween Taiwan Basin.Fully absorb and utilize the chronostratigraphy, biostratigraphy of the research willtower Henan Area A Ordovician sequence is divided into14three sequence analysisand sequence key interface on the basis of a detailed deposition, the average time limitof about4.21Ma, Which Penglaiba the SQ1, SQ2(not DrilTech) the Yingshanincluding SQ3, SQ4, SQ5SQ6(SQ3, SQ4not drill up), a house group for SQ7thePradesh Buck group includes SQ8, SQ9Lianglitage SQ10, SQ11, Sangtamu groupSQ12, SQ13, SQ14.