Abstract
The West Slope of SL Basin, China, mainly targets on lithologic reservoirs for oil and gas. The paleogeomorphology and provenance direction analysis has great significance for predicting the type and distribution of sand body. According to the analysis of well logging, core and seismic data, braided delta and gravity sediment mainly develop in the study area. A backs tripping method is used to reconstruct the topography of Qingshankou to Yaojia Formation, Cretaceous. The West Slope is mainly controlled by two slope belts in Qingshankou Formation, with the width of upper slope 12 - 18 km and the gradient 0.7 - 0.8 degrees, the width of lower slope 13 - 15 km and the gradient 1.0 degrees. The West Slope is controlled by a single slope belt in Yaojia Formation, with the lower slope width of 13 - 16 km and the gradient 0.4 degrees. The relationship between the slope belt, provenance direction and sand body distribution is analyzed, and result shows that the combination of upper and lower slope controls the distribution of reservoir types, and the provenance supply rate controls the scale of sand body. The gravity flow develops when the provenance direction is parallel to slope direction, and the slope becomes transporting channel in vertical to provenance direction. The paleogeomorphology, lake level and provenance direction are the main control factors of sand body in West Slope.
Highlights
The relationship between the slope belt, provenance direction and sand body distribution is analyzed, and result shows that the combination of upper and lower slope controls the distribution of reservoir types, and the provenance supply rate controls the scale of sand body
Combined with the gamma ray and density logging curves, it is found that braided-delta, gravity sediments, coastal and shallow lake sediments mainly develop from Qingshankou to Yaojia Formation in the Western Slope, and the main reservoirs are delta front sand bodies, biotic bar and gravity sediments
The previous study mainly focuses on the genesis and evolution of the slope belt in the Western Slope, where the thickness map of present strata is mainly used to reflect the variation of geomorphology [14]
Summary
Xin et al analyzed the characteristics of slope belt and its control on reservoir distribution by means of well loggingseismic analysis, stratigraphic correlation and sedimentary facies analysis [8]. Guo et al studied the control of slope belt on sequence, and reservoir distribution characteristics by using high resolution 3-D seismic data [9]. The relation between slope belt, provenance direction and sedimentary system distribution is analyzed, and the reservoir development pattern and main controlling factors in the lacustrine basin are studied. It provides a reference for further evaluation of the exploration potential of the Western Slope
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