Studying On Relationship Between Characteristics And Oil-gas Accumulation In Lower Paleozoic Carbonate Reservoir Of Buried Hills In Jiyang Depression

Oil in our country is mainly produced by detrital reservoir. Petroleum reserves in carbonate reservoir are only one-tenth of the total production. Natural gas yields, however, only holding a small part in petroleum production, are nearly equal in both type reservoirs. Such situation does not match the ratio that carbonate formation hold in the strata. Richly Accumulative zones of oil-gas in carbonate rocks have three types: huge upheavals, organic mounds and buried hills. The paper mainly discusses carbonate reservoir in buried hills.Contradictions of reserve resources in Shengli oil field stuck out increasingly in recent years. It is difficult to keep the constant production in this area. Exploration and exploit step into the stage of finding concealed detrital or fracture and hole pools, exploiting complex pools.This paper studies the characteristics of Lower Paleozoic carbonate reservoir in buried hills of Jiyang depression of Shengli oil field, probes into the petrological and geophysical characteristics of carbonate reservoir, analyses the the function of regional tectonic movement in fracture forming. The author also divides the fracture spaces in to three types, studies the scale, distribution and controlling factors of the fractures, and points out the richly producing zone. Karsts in studying area also have three models. Finally, the author analyses the relationship between reservoir characteristics and oil-gas accumulation, points out the main direction of later exploration. The paper includes several fresh views that will be useful in later exploration.