Study On Petroleum System And Prediction Of Lithologic Oil Reservoir In Changling Depression, Songliao Basin

Guided by petroleum system theory, this thesis systematically uses geological and geochemistry data to do a research on petroleum system, describes the dynamic characteristics of the system, focuses on hydrocarbon producing potential and oil migration and accumulation processes; based on the dissection of exemplary reservoirs, analyzes producing and reservoir and cap configuration, as well as filling process, studies reservoir layer type and geometrical shapes, predicts favorable exploration zone utilizing geophysical technology, makes scientific appraisal of resource potential and exploration prospect. Negative structures are the vital exploratory and producing target in the near future. Based on these researches, combining with the current exploratory results, the study that reveals accumulation theory and controlling rules of incline delta within giant lacustrine basin and summarizes procedures and methods on how to explore and research, provides guidance for the similar basins exploration.The study comprehensively analyzes substantial geological, well logging, seismic and other experimental data, finishes observation of more than 30 wells'core and 5 field geological profiles, sets up 12 kind of database including strata and lithology and oil test, etc. makes more than 100 maps of all kinds, interpret more than 1000 meter long seismic profiles, submits reports with more than 80 thousand characters. The project basin models Changling subsidence, analyzes oil accumulation process and distribution patterns, make scientific appraisal of resource potential, pinpoints favorable facies and exploration targets, accomplishes the follows:1,Taking comprehensive basin modeling as the main method, analyzes petroleum system, concludes that the two suits source rock have their own characteristics, Qinshankou formation source rock with high abundance and good kerogen type, becomes thicker northwards, maturity has already comes to large amount discharge phase, and Ro value is between 0.8 and 1.0; Nenjiang formation source rock gets better quality and more thicker than Qinshankou formation, but lower maturity affects its hydrocarbon produced.2,According to spatial and temporal dynamics analysis of petroleum system, systematically summarizes hydrocarbon producing and discharging history, as well as critical moment, also applies various methods to study oil accumulation periods, with oil source correlation and bury history results, establishes spatial and temporal configuration relations in different depository system tracts sand and petroleum distribution.3,Systematically summarizes oil distribution pattern and high production controlling factors in different depository systems, predicts facies favorable to accumulate oil in different layers. Utilizing 3D seismic data, together with borehole data, predicts sand spatial distribution, fatherly combines structure and fault distribution pattern and petroleum system dynamics to make reservoir description, predicting favorable targets.4,Comprehensive application of New theories, new technology and new methods, dramatically accelerates the exploration process of subtle oil pools. Daqingzijing oilfield is a giant full load lithological reservoir in incline areas of Changling subsidence, which distributes with great subtlety.The study systematically summarizes petroleum accumulation mechanism and research methods in inline delta of giant lacustrine basin, providing theory accordance for the next exploration strategy in Jilin Oilfield. This study will undoubtedly be the technical support for optimization of the exploratory targets in the eleventh five years.