The Research On Stratigraphic Sequence And Sedimentary System Of Oil Shale In Liu Shu He Basin ,Ning An Basin

LiuShuhe and NingAn basin is a small basin, oil shale occur in the Paleogene strata.This paper uses sedimentology, sequence stratigraphy and other disciplines to study the area of oil shale depositional systems, sequence stratigraphy and the occurrence of a favorable area .Based on the observation and description of the core , combined logging and rock grain size with the morphological characteristics analysis , in the study area of paleogene`s target horizon,it can identify fan delta and two sedimentary facies of lake.And further divided into six series of sedimentary facies and microfacies.After a comprehensive judging the main phase of oil shale develop in the lake within the lake subfacies.Through sequence by single well the sequence stratigraphic framework is established in the study area and the system of the domain divided.Through the reseach of the tectonic subsidence rate and sediment supply rate,get the analysis of changes of accommodation space.Further , it will obtain the distribution characteristics in the oil shale in the sequence stratigraphic framework.In the study area oil shale is mainly developed in the water into the system domain and highstand systems tract.Purpose of the study area are the statistics of stratigraphic thickness of the layers of sandstone thickness and the analysis of the sand. The main source direction during the deposition will be confirmed finalization of the study.WuLin and WuHe rift of LiuShuhe basin source are its east rift uplift,low position of the central uplift provenance mainly from the north and the adjacent plate faults.In NingAn basin the provenanceis of Well 101 guessed fromthe north side of the sediments.Based on the sedimentary facies and provenance analysis, research LiuShuhe basin evolution, divided into the early settlement, the largest settlement and the shrinking stage .Oil shale is mainly developed in the early settlement period to convert the maximum settlement.By the analysis of the distribution area of oil shale ,the distribution of favorable areas is predicted. the distribution of oil shale for the Southwest - North East trending fault-controlled in LiuShuhe basin.Mainly enriched in the southwestern part of the WuLin WuHe rift and adjacent parts of rift.With the direction of the oil shale to fracture it gets a single layer thickening and the trend of increasing number of layers.Northeast of the oil shale basin is not developed. In NingAN basin the well 101 area affected by the basalt layer.Oil shale is only a single well `s hole.Wave region and the well Y1,its north and south of theQianYang cut off the low part of the favorable development of oil shale interval.