Tight Sandstone Gas Reservoir Of Tuha Basin Resources Evaluation And The Key Parameters Selection

In recent years, the rapid economic development of our country, the demand for energyis also increasing, but decades of continuous exploitation and utilization of energy, theconventional oil and gas resources are drying up, no longer meet the needs of industrialdevelopment, The extraction of unconventional oil and gas resources are gradually on theagenda. As an important unconventional oil and gas resources, the success of tight sandstoneoil and gas exploration in North America, let the oil exploration, saw the new direction in ourcountry. Drill encounter ShuiXiGou Group of exploratory well in Taibei sag of Tuha basin are84, of which74Wells to see oil and gas shows that more than80%focused on the Baka andWenjisang area (i.e., the study area--Qiudong sub-sag), has been proved to have tightsandstone oil and gas in the study area wide range as basic conditions.In studies using analogy method, volume method and genetic method, three methods ofcomputing resources in the study area, and focuses on calculation of the selection of keyparameters involved in the process. Through the SAN Juan basin in the United States, Albertabasin in Canada and Ordos basin in China and the Western Sichuan basin, analogy, it isconcluded that the tight sandstone gas resource in the study area: Xishanyan Group resourcesis320.66×108m3, Sangonghe Group resources are512.49×108m3. In the process of volumemethod, the study area was determined by the research of tight sandstone oil and gas reservoirdensity limit, in view of the dense reservoir characteristics in the study area, to modify theparameter calculation formula, which calculates the geological reserves in the study area: oilgeological reserves of Xishanyao Group are511.98×104t,gas geological reserves are182.32×108m3; oil geological of Sangonghe Group reserves are424.93×104t,gas geologicalreserves are164.31×108m3. There are three kinds of hydrocarbon source rocks in the studyarea: mudstone, carbonaceous mudstone and coal, which is given priority to with mudstoneand coal. Collected samples of source rocks in the study area for organic matter hydrocarbongeneration thermal simulation experiment, the chemical kinetics and calibration model is setup according to the experimental results, combined with the thermal history and burial historyin the study area and the development of hydrocarbon source rocks and distribution of thehydrocarbon of source rock in the study area, then according to geological conditions in thestudy area determine the migration and accumulation coefficient, and computing resource. oilresources of Xishanyao Group are911.32×104t，gas resources are343.78×108m3，oilresources of Sangonghe Group are705.38×104t，gas resources are293.38×108m3.