Depositional System Of Chang8Oil Formation Of Triassic Yanchang Formation Of The Western Nanliang Area Ordos Basin

This subject in reference to the regional geological data and earlier findings basis, make full use of the basic principles and methods of modern sedimentology and petroleum geology as a guide, relying on field geological profile, through the Western Nanliang surrounding exploration wells, appraisal wellsand about more than200wells in production well construction, combined with the South beam the Western production block has been built all types of well data, the fine stratigraphic division, the establishment of the regional sequence stratigraphic framework; as the basis of regional stratigraphic correlation, on the Chang8fine stratigraphic correlation and division; the use of cluster analysis of the light minerals, heavy minerals cluster analysis, paleocurrent analysis and rare earth element enrichment law analysis method to judge the source direction of the Chang8oil formation; typicalphase signs of the rocks, fossils mark, logging facies indicators, the ratio of sand to sand body distribution law, to determine the sedimentary facies, sedimentary microfacies types and characteristics; and carry out long eight main oil layer reservoir study.Western Nanliang extension of the sediments with mixed source characteristics can be divided into three zones, namely the formation of three partitions. South West, West and Northeast, the ancient land of the basin surrounding control, removal from a distance. Sand bodies of the study area, North East-West to the distribution of sand bodies of the Chang8plane on contiguous. Extend according to the Western, Southern Liang, a formation of rock types and characteristics of the sedimentary structure types, sedimentary and tectonic features and logging flag to determine the South beam the Western long delta front deposits, sedimentary microfacies delta front, subaqueous distributary river and shunt between the main Bay.