| The condensate gas reservoir in the Yingmai 7 Area is one of the main areas of the Yingmouli gas field group.The gas-bearing area of the reservoir is 20.1km~2 and its effective thickness is as high as 22.1m.After nearly 10 years of depletion-drive development,there are 14 wells in the block,of which 5 wells are running in the normal,a well is working with water and 8 wells are shut down due to high water cut.Thus,the overall production situation is not optimistic.As the gas production rate is higher than that of the program design,which give rise to the increased pressure-drop and reserves.While the energy of the water body is large,which results in that over half of the gas wells in the whole gas field can not be normally produced due to the high water cut.In addition,there are still about five-meter-thick base-oil in the condensate gas reservoir.Because of the large well spacing,as well as the influence of the mudstone interlayer,some of the remaining oil(the base oil)can not be better exploited.At present,there are some cognitional problems in the target layer of the area:Firstly,the understanding of the reservoir in the study area is not deep enough;Secondly,it is not clear enough to study the distribution of the interlayer in the study area;Thirdly,the degree of exploitation of the remaining oil still needs to be improved,and the remaining potential and potential area of the condensate gas reservoir also need to be clearly implemented.In this paper,through the investigation of the relevant data of the region and the basic research of the former people,the author analyzes the Paleogene bottom sandstone section(E sandstone section)and the Cretaceous Bashijiqik sandstone section(K sandstone section)on the fine stratigraphic division and comparison,and study of depositional model.The reservoir is divided into 11 layers,and a fine stratigraphic framework and corresponding sedimentary microfacies are established.In order to clarify the lithology,physical properties and logging characteristics of the E sandstone and K sandstone reservoirs in the Yingmai 7 block,the identification and distribution of the interlayers distributed in the reservoir are predicted and analyzed.The interlayer is mainly developed as a paste mudstone compartment,a mud interlayer and a physical interlayer.The paste mudstone compartment is mainly located at the top of the reservoir,which is a cover layer of condensate gas reservoir.The mud interlayer and physical interlayer are mainly distributed in the reservoir,which is the the focus of this paper research object.On the basis of those,the modeling software PetrelRE2014 was used to establish the three-dimensional reservoir geological model,describing the spatial distribution pattern of the interlayer.Compared with the distribution of single well interlayer in 14wells,it coincides with the reality.Finally,according to the actual situation of the development of condensate gas reservoirs in the Yingmai 7 block,the water cone shape and the distribution of residual oil in some wells are analyzed from the geological point of view by establishing the conceptual model and numerical simulation method.Understanding the water invasion mechanism and the distribution model of the remaining oil,is helpful for the fine mining of the late condensate gas field and the tapping of the remaining oil. |
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