西部凹陷東部陡坡帶砂礫巖體成藏特征勘探精細(xì)化研究
[Abstract]:The study block is structurally located in the central northern section of the eastern steep slope zone of the western Liaohe depression and the Chenjia depression with a structural area of 166.2 km2. Archean buried hill reservoir, Lower Tertiary Shahejie formation and Dongying formation have been discovered successively. Among them, Shahejie formation is the main reservoir of Lengjia Oilfield. The strata exposed by drilling are Archean Mesozoic Lower Tertiary Fangshenbao formation Shahejie formation Dongying formation Upper Tertiary Guantao formation Minghuazhen formation and Quaternary strata. The formation of Lengjiapu heavy oil reservoir is firstly controlled by the sedimentary facies characteristics under the specific tectonic background in the steep slope zone. There are two sedimentary systems in the oilfield: steep slope fan delta-sloughing turbidite fan and axial gravity flow channel sedimentary system. The deep faults in the Lengjiapu steep slope zone are relatively developed, which directly provide the conditions for the vertical migration of oil and gas. The structure belt is near source distribution and has better oil source conditions, structure, sedimentation and other elements matching, which provides a guarantee for the oil and gas enrichment in this area. The fan delta sedimentary facies controlled by deep fault in steep slope zone determine the development pattern of heavy oil reservoir with medium thick-block bottom water and middle thick bed edge bottom water. There are two types of pool-forming models in this area: active controlled reservoir formation and fault-controlled reservoir formation. The distribution of source rock and sedimentary facies zone control the degree of oil and gas enrichment and have great exploration potential. The characteristics of reservoir development in this area are as follows: the Chenjia fault is the boundary, the western Lengjia depression has less oil-bearing strata, and the oil layer of the third member of Shahejie formation is mainly developed, and the thickness of the reservoir is thin. There are many oil-bearing strata in Lengjia fault anticline zone, four sets of oil-bearing strata are developed, and the thickness of oil layer is large, especially in the third member of Shahejie formation. The deep faults in the Lengjiapu steep slope zone are relatively developed, which directly provide the conditions for the vertical migration of oil and gas. The structure belt is near source distribution and has better oil source conditions, structure, sedimentation and other elements matching, which provides a guarantee for the oil and gas enrichment in this area.
【學(xué)位授予單位】:東北石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P618.13
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