| Liaodong Depression is an important oil producing region in Bohai Bay Basin. The exploration and development of it has reached a high level. That’s the reason why need to find new areas of exploration potential and it’s necessary to strengthen the study in hydrocarbon accumulation. The accumulation process is a complicated dynamic process which involves the spatial and temporal configuration of multiple elements. Up to now, people have deep understanding towards the relationship about the allocation in space of Liaodong Depression. But the research on the dynamic matching of time is not systematic enough. Based on the survey of the typical feature of hydrocarbon accumulation, the main controlling factor of the Liaodong Depression is hydrocarbon source rock, fault system, trap temperature and pressure system and so on. According to these and through the research methods like hydrocarbon generation kinetics, basin modeling, geochemistry of oil and gas, sedimentary structure analysis, we can have a research on the matching relation of time of thermal evolution of hydrocarbon source rocks, hydrocarbon generation and expulsion process. Trap evolution process fault system, hydrocarbon emplacement and infilling periods. It can help to recovery coupling dynamic process of the accumulation of Liaodong Depression. As a whole, the main achievements are listed as following:(1)The main controlling factors of hydrocarbon accumulation in Liaodong Depression are as follows. The evolution of hydrocarbon source rocks determines the difference of hydrocarbon fluid properties and the distribution of high quality hydrocarbon source rock controls the distribution of oil and gas enrichment area. The fault system controlled the distribution and quality of the reservoirs, the migration and preservation of oil and gas. Abnormal high pressure not only provides the hydrocarbon source rocks to provide hydrocarbon expulsion dynamics, but also conducive to the preservation of the underlying oil and gas. The formation time of effective traps determines the success or failure of oil and gas accumulation.(2)Based on the single well, 2D and 3D simulation of the dynamic model of Easy%Ro,the results showed that at the end of Ed3(dating back 30.3Ma), the hydrocarbon source rock of Es3 and Es4 have got into hydrocarbon generating threshold.The hydrocarbon source rock of Es1 and ED haven’t got in to hydrocarbon generating threshold. Ed1 at the end of the deposition(dating back 23.3Ma)and Es3,Es4 of the hydrocarbon source rock to oil and gas generating peak stage,Es1 and Ed hydrocarbon source rock in the threshold of hydrocarbon generation.Nowadays, the main source rocks are in the stage of hydrocarbon generation.The maturity of Northern part is higher than middle and southern part. The southern section of hydrocarbon generation threshold at the latest time.(3)From the stage of tectonic evolution, combined with the Liaodong tectonic stress field and fracture profile evolution. According to the vast quantities of the fault fault ages, breaking points, fault break distance and the thickness difference of hanging wall and footwall, recovered of the fracture system of Liaodong Depression in the activity of every sedimentary period. BP 65-38 Ma the main faults of the stage were mostly in the initial development stage, and activity rate were less than 30m/Ma. BP 38-32.8Ma, activity rate began to increase, the rate of activity concentrated in the 30-60m/Ma. Dating back about 32.8-24.6Ma, in the northern part of the performance as Liaoxi No. 3, Liaozhong No.1, Liaodong No. 2 had a certain activity, the rate of activity concentrated between the 30-90m/Ma. Ng sedimentary period(about 24.6-12.0Ma) of the fault into the development of the setting period, more in a static state. Only the northern Liaozhong No. 2 have some activity, activity rate was 6.23 m/Ma.(4) The biggest overpressure in deep northern Liaozhong depression, the pressure coefficient can reach 1.6~1.8. The two section is mainly distributed in the Dongying group to a group of Shahe street and Shahe Street Group Three and Liaoning raised abnormally high pressure in Liaozhong sag. Through the jz25-1 Shahejie Group oil gas inclusion bodies capture pressure coefficient calculated values in between 1.20~1.40 inferred the Liaodong Bay depression depression in the northern part of the oil and gas mass filling period of formation overpressure is generally developed.(5) The recovery in North Liaodong Bay depression uplift, Liaodong uplift zone, Liaozhong sag, the middle uplift and Liaozhong sag of Liaozhong sag zone and the southern region of reservoir coupling dynamic process, with large oil and gas field has been found in contrast to reservoir prediction in Liaodong coupling process. North of Liaodong uplift zone JZ23 structure is beneficial to oil and gas pointing area, the forming factors between has better dynamic coupling relation. |
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