The Research Of Sequences And Sedimentary Characteristics Of Qi3-17-5Block In Liaohe Depression

The main purpose of Layer Lotus reservoir of Liaohe depression Qi3-17-5blockis divided into upLotus reservoir and down Lotus reservoir. The Lotus reservoir arethe lakebed fan facies, lithologyare gray, shallow gray white sandstone, conglomerate,conglomerate. This article according to the Reservoir static and dynamic data, usingthe high-resolution sequence stratigraphy theory and perspectives, in order toconfirmthe division standard of the Lotus reservoir geological units, and based on the existinghierarchical scheme, completed the group of oil reservoirs, sandstone layer and themain reservoir sand body region division and correlation. According to a variety ofinterface identification, it can be established a long-term of base-level cyclic sequencestratigraphic framework, and analysis for each sequence of the mid-cycle stackingpatterns within sequence stratigraphic framework, In accordance with the maximumflooding surface MFS1and for the first timeLake Panthe surface FFS1, FFS2, andfurther up the division of the layer group.MSC1：It is a rising hemicycle, the stratigraphic thickness is about150m, cycle isdivided into one sandstone group, seven small layers, in the bottom of strata of thedown lotus.MSC2：The stratigraphic thickness is about270m, cycle divided into twosandstone groups,15small layers, in the upper strata of the down Lotus.MSC3：The stratigraphic thickness is about215m, cycle divided into twosandstone groups,15small layers, in the Lotus strata.Through the region internal wells of Sedimentology compilation map andregional earthquake, analysis of particle size and the remains of fossil fabric,found Qi3-17-5block has a gentle slope to gravity flow based bottom of the lake fandepositional features,and it has typical underwater Canyon (supply water), inner fan,middle fan and outer fan four Asian. This block is mainly the fan subfacies, it canbefurther divided into braided waterways, distinguish the lateral margin of likewaterways, waterways, fan the leading edge of four microfacies. The lithology aremainly of the conglomerate, coarse sandstone, fine sandstone, siltstone and mudstone interbedded, common as graded bedding, wavy bedding and horizontal bedding.