渤中凹陷古近紀(jì)的洼陷分布、充填特征與勘探方向
[Abstract]:The Paleogene of Bozhong sag was affected by the tensile stress of the near north and south direction, forming different synsedimentary faults in the near EW direction and NW direction, which controlled the structural morphology of the depression and the depression respectively. According to the variation of formation thickness in different strata of Paleogene, taking synsedimentary fault, uplift or long-developed underwater uplift as the boundary, the Bozhong depression can be divided into four sag: northeast sag, southeast sag, northwest sag and southwest sag. The degree and spatial distribution of structural steep slope zone, subsidence gentle slope zone and low uplift zone are different in different sag. The analysis of sedimentary facies combined with well and earthquake shows that fan delta with short distance precession is developed in steep slope zone adjacent to uplift of Paleogene depression, braided river delta with long distance precession is developed in gentle slope zone, and shoreline shallow lake deposit is dominant in low uplift zone. The main developing periods of source rocks in Bozhong sag are the strong filling stage of the third member of Shahejie formation and the brackish water period of the first member of Shayi formation. After recovering the geochemical parameters of source rocks, the hydrocarbon generation and hydrocarbon expulsion of each sag are simulated and calculated by using Petrol Mod software. The results show that the formation of resources in the third member of vertical upward sand is the largest, followed by the third member of the east and the second member of the first and second member of Shahejie formation. The northeast sag is rich in resources, followed by southwest sag, southeast sag and northwest sag. At present, almost all of the oil and gas are discovered from Shahejie formation, and fault is the main migration channel for oil and gas migration to shallow layer. Under the control of fault migration system, the main oil and gas exploration directions of different sag are determined.
【作者單位】: 中國石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院;海洋國家實(shí)驗室海洋礦產(chǎn)資源評價與探測技術(shù)功能實(shí)驗室;大慶油田采油八廠;
【基金】:國家科技重大專項(2008ZX05023-001-004-002,2011ZX05023-001-013)資助
【分類號】:P618.13
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