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Braided River Delta Sand-Body Distribution and Reservoir Predication in a Transfer Zone: Example Previous HitFromNext Hit the Paleogene Wenchang Formation, HZ-A Block, Huizhou Sag, Pearl River Mouth Basin, Previous HitChinaNext Hit

Abstract

The Pearl River Mouth Basin, is one of the most important petroliferous basins in Previous HitChinaNext Hit. The Paleogene Wenchang Formation is an important hydrocarbon-bearing stratigraphic unit (buried depth > 3500m). HZ-A block, located in the south of Huizhou Sag, covered with Previous Hit3-DNext Hit Previous HitseismicNext Hit Previous HitdataNext Hit and only four drilling wells. However, the Previous HitseismicNext Hit Previous HitdataNext Hit is characterized by narrow effective-frequency band and low resolution. Therefore, sedimentary body features including thickness and physical property, which cannot be described precisely and quantitatively by techniques of sequence stratigraphy or Previous HitseismicNext Hit sedimentology technology alone. A high resolution Previous HitinversionNext Hit technique named Previous HitseismicNext Hit phase-controlled nonlinear random invertion has the advantage of Previous HitseismicNext Hit prediction for thin sandstone. It is not limited to the constraint of an initial model and provides Previous HitinversionNext Hit results with clear geologic meaning. By using Previous Hit3-DNext Hit Previous HitseismicNext Hit Previous HitdataNext Hit and well Previous HitdataNext Hit, taking techniques of Previous HitseismicNext Hit phase-controlled nonlinear random invertion, combined with sequence stratigraphy and Previous HitseismicNext Hit sedimentology, sedimentary facies and sand body distribution of the SQ2 of Wenchang formation has been analyzed in detail. The results are as follows: (1) Braided river delta of three periods are identified in the transfer zone (Previous HitfromNext Hit base to top: namely D-1, D-2 and D-3), the delta was deposited jointly by the provenances, which controlled different periods of delta. The major oil reservoir is located in the D-2, and the thin sandstone layer of 8~15m can be distinguished in Previous HitinversionNext Hit profile. (2) The underwater distributary channel and mouth bar are the favorable reservoirs. We also depicted the thickness map of sand-body (porosity>8%) distribution of D-2. (3) Finally the Previous HitstructuralNext Hit-lithologic trap under the complex geological conditions is identified. In continental basins, the sedimentary facies change quickly, the thickness of sand body is usually thin and the Previous HitseismicNext Hit quality of deep-baried formation is often not good, which bring great difficulties to the predication of sand-reservoir. This study demonstrates that facies architecture and sand-body distribution analysis using sequence stratigraphy, Previous HitseismicNext Hit sedimentology and high resolution Previous HitinversionNext Hit may serve as an effective approach for petroleum exploration in areas lacking of wells or outcrop Previous HitdataTop.