In Fuyang oil layer, the later-period structure is complex; the reservoir is mostly composed by river-way sand; the oil and gas reservoir is significantly concealed, so it is greatly difficult to identify. To accurately describe the reservoir, facies controlled reservoir is simulated stochastically using Geocad software in the study area: Lithofacies is first established using Gauss truncation algorithm to construct a facies model of mudstone, dry sandstone, poor sandstone, and sandstone, and its fitting rate is 0.814, and then a porosity model is established using sequential Gauss method under the constraint of the lithofacies model and its fitting rate is 0.814, and its correlation coefficients are as follows: 0.845 is for sandstone; 0.893 is for poor sandstone; 0.915 is for dry stone; a permeability model is established using cloud transformation method under the constraint of the porosity model and its fitting rate is 0.732, and its correlation coefficients are as follows: 0.695 is for sandstone; 0.734 is for poor sandstone; 0.824 is for dry sandstone. These prove that the facies controlled reservoir modeling based on Geocad plays a significant role in the areas where the later-period structure is complex and sand is thin and changed intricately. Thus, the needs of the oil field exploration and development can be fulfilled by the model to a certain extent.
Introduction to Examples of Unconventional Oil and Gas Reservoir Modeling/Simulation