Establishment and Application of a New Parameter Model for Quantitative Characterization of the Heterogeneity of Thick, Coarse-Grained Clastic Reservoirs: A Case Study of the Badaowan Formation in the Western Slope of the Mahu Depression, Junggar Basin, China

The rock composition of thick-layer, coarse-grained clastic reservoirs is complex. There are large variations in granularity and poor selectivity. Reservoirs rocks extremely heterogeneous. Current conventional parameters for quantitative characterization reservoir heterogeneity, such as the calculation values permeability variation coefficient, rush contrast, unbounded, have different representation angles, quantification degree method not high. This study takes thick layer coarse-clastic developed western slope Badaowan Formation Mahu Depression Junggar Basin an example. Through core observation, microscopic characteristics, analysis laboratory data, a new parameter heterogeneity proposed, interpretation model established. results were follows. (1) pore development thick, complicated, sorting structure poor, strong, has double peaks. (2) We propose to evaluate heterogeneity: fluctuation coefficient. essentially compares average two adjacent sites with permeability. coefficient can reflect fluctuations permeability, larger stronger heterogeneity. In addition, it advantages clear target, bounded same angle, etc., thereby realizing macro under unified standard. (3) was used Depression. Most wells area had about 0.3, but others ranged between 0.2 0.6. It concluded that area, better oil content because these types strong effectively strength also provide reference further enrichment research.