Sedimentary models for near-source shallow glutenite fan delta and their effects on reservoir distribution:A case of the first member of Shawan Formation in Chepaizi Uplift
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TE122.2+21

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    Abstract:

    Near-source shallow glutenite fan delta is developed wildly in the first member of Shawan Formation in Chepaizi Uplift. Its sedimentary characteristics are complex and the lithology,physical properties and oil-bearing properties can vary significantly. Thus,it’s difficult to carry out the oil and gas exploration in this type of glutenite. Therefore,it is necessary to study the distribution characteristics of the glutenite reservoir in the near-source fan delta in the study area. The sedimentary characteristics of the glutenite were studied by analyzing the core data. Based on the analysis of palaeogeomorphology and seismic reflection characteristics,the near-source fan deltaic facies in the first member of Shawan Formation of Chepaizi Uplift was divided into two types of sedimentary filling model-the retrogradation type and the vertical aggradation type. For the former type,the glutenite retrogrades backward obviously in space with an overall positive rhythm and ob? vious sedimentary facies transition;while for the latter type,the glutenite aggrades vertically to make its thickness great without obvious change in sedimentary sequence and sedimentary facies. According to the statistical analysis of reservoir physical properties data,the lower limits of the reservoir physical properties for the near-source shallow glutenite reservoir in the first member of Shawan Formation were determined(porosity:16%,permeability:21 mD). The glutenite in the fan delta front is effective reservoir with good physical properties;while the glutenite in the fan delta plain is not reservoir due to its poor physical properties,which can act as lateral sealing layer. Therefore,in the retrogradation type,the effective reservoirs are superposed retrogradationally and scattered in space,while in the vertical aggradation type,the effective reservoir,which is very thick in vertical,can be found in the anterior and middle of the fan delta.

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YU Tengfei. Sedimentary models for near-source shallow glutenite fan delta and their effects on reservoir distribution:A case of the first member of Shawan Formation in Chepaizi Uplift[J]. Petroleum Geology and Recovery Efficiency,2018,25(4):54~60

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  • Online: June 04,2018
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