The Research Of Inner Structure Hydrocarbon Accumulation Conditions Of Metamorphic Rock Buried Hill In Liaohe Depression

This study project is a key project of scientific research on oil and gas accumulation in inner buried hill metamorphic reservoir. The purpose of this study is to establish a set of evaluation methods for buried hill of metamorphic rock using Xinglongtai-Majuanzi buried hill discovered in recent years as an example. Meanwhile, these methods are used to analyze inner buried hill metamorphic reservoir. forming conditions in Liaohe depression, and to guide future exploration of inner buried hill.This study has achieved the following results and understandings:1,Establishment a method of Evaluation metamorphic rock buried hill of liaohe Depression using loging techniqueIn order to Establishment the method of Evaluation metamorphic rock buried hill many ways are employed ,including: Oil Test,producing test,Analysis data, based on crosspiot and core contrast , Establishment a method of Evaluation metamorphic rock buried hill of liaohe Depression using loging technique using FMI and ECS (Elemental Capture Spectroscopy Sonde) longing technology ,By which ensure the lithology and reservoir of Xinglongtai-Majuanzi buried hill and disclose the characteristics of the fractures.2,The impact of lithology on reservoir forming in metamorphic buried hill,Analysis of other metamorphic buried hills in Liaohe depression and investigation of metamorphic buried hill exploration in Bohai Bay Basin indicate that any lithology may have the possibility of being reservoir rock if provided with proper geologic conditions of source rock, cap rock, trap, migration and preservation. However, the lithology with little dark mineral in metamorphic buried hill is more likely to become reservoir rock, i.e. the dominant lithology (with little dark mineral) concept.3,Study the distribution rule of the reservoir and controlling factors of the inner buried hill metamorphic reservoirThe storage capacity of buried hill metamorphic weathering crust is related to above overlapping .When the above overlapping is paleogene, organic acid of hydrocarbon source rocks dissolution the above overlapping, the reservoir will be better ,otherwise, the above overlapping will fill in the weathering crust .4,Inner buried hill within oil-rich sag and"subtle"buried hill have good oil accumulation conditionsIn S4 and S3 members in Liaohe depression, sources rocks are widely distributed, thick, high abundance, with good type and complete thermal evolution stages, including source rocks of both low and high maturities, had generated a variety of hydrocarbon products and provided rich material basis for oil and gas accumulation in the buried hill. In the process of recent buried hill exploration in Liaohe depression, breakthroughs have been made in low buried hill and inner buried hill. Those buried hills which had been neglected or considered not having reservoir forming conditions are extensively distributed in the depression and have vast exploration potential. Unremitting exploration efforts in Damintun buried hill make us think whether the vast buried hill areas in all the basement formations under source rocks in oil-rich depression are important exploration domains in the future.5,Establish reservoir forming mode of inner buried hill metamorphic reservoirThis study has proved that there exist laminar strata in metamorphic buried hill and the lithology is comparable based on seismic, geologic and logging data, using oil testing, production test and assay data, and through analyzing metamorphic diagenesis and experiment data. Formation and lithology stratification is the material basis of existing laminar, metamorphic, structural buried hill reservoirs. The exploration practice in recent years indicates that there exist laminar structural reservoir types in the metamorphic buried hills in Liaohe depression. The main controlling factors of oil and gas accumulation in inner buried hill have been determined. This point of view is of significant importance to deep exploration in metamorphic buried hills in Liaohe depression.6,Lithology,fracture,oil and gas pools,Preservation are the mine four factors in burn hill exploration. This thought is used in guiding the Xinglongtai-Majuanzi exploration.In 2005 we deploy and actualize XINGGU 7,by which we build up the new model of inner buried hill metamorphic reservoir.7,By the model we built and contacting the actuality of LIAOHE Depression burn hill exploration,we can know that many region can be the relay area of buried hill explorationIn the process of the study, research techniques for inner buried hill reservoirs in Liaohe Oilfield have been developed:a,Determine the distribution and geometry of metamorphic buried hill with gravity, magnetic, electric, and 3D seismic methods;b,Determine the structure and fracture characteristics of buried hill with drilling data, 3D seism and VSP;c,Determine buried hill lithology and reservoir characteristics with coring, cuttings observation and assay analysis data;d,Determine inner buried hill fracture and reservoir distribution with logging and other techniques.