Abstract
By taking the third member of the Dongying Formation in the Cha71 fault block of the Chaheji oilfield as an example, the single sand body of the deltaic front underwater distributary channel is meticulously depicted by using the data of well logging and performance production. Portrays the vertical separation model, total lateral separation type, vertical type, lateral superposition type, 4 types of single sand body vertical superimposed and bay type, bank contact between docking, instead of four kinds of single sand body lateral contact type, and summarizes its logging facies identification. The quantitative prediction model of the single sand body was established, the characteristics of single sand body plane distribution were summarized, and the identification of the oil-water layer and the lower limit of reservoir effective thickness were studied. And we got the conclusion that based on the fine characterization of the single sand body and the lower limit standard of effective reservoir thickness, the distribution range of the effective reservoir and connecting unit is determined. Finally, the connectivity of the connecting unit is verified by dynamic data.
Highlights
At present, most of the old oilfields in eastern China have entered the stage of high water cut after several rounds of water injection development
The quantitative prediction model of the single sand body is established, the plane distribution characteristics of the single sand body are summarized, the identification of oil and water layers and the lower limit of effective thickness of the reservoir are carried out, the distribution range of the effective reservoir and connected unit is determined, and the connectivity of the connected unit is verified by dynamic data
The 175 mS/m boundary can well separate the test oil layer from the test water layer, and the resistivity value corresponding to the 175 mS/m induced conductivity is 5.7 Ω m (Figures 3 and 4)
Summary
Most of the old oilfields in eastern China have entered the stage of high water cut after several rounds of water injection development. In this study, taking the east third member of the Cha fault block in the Chaheji oilfield as an example, the contact type of the single sand body in the study area is accurately identified by comprehensive utilization of logging and production performance data, and the identification marks of logging facies are summarized. The quantitative prediction model of the single sand body is established, the plane distribution characteristics of the single sand body are summarized, the identification of oil and water layers and the lower limit of effective thickness of the reservoir are carried out, the distribution range of the effective reservoir and connected unit is determined, and the connectivity of the connected unit is verified by dynamic data. The Cha fault block in the Chaheji oilfield is located in Baxian County, Langfang City, Hebei Province, belong-
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