斷陷湖盆早期淺水三角洲沉積——以高郵凹陷永安地區(qū)戴一段為例
[Abstract]:As a hot spot in sedimentology and oil and gas exploration, shallow water deltas are mainly focused on large depression basins, but less attention is paid to faulted lacustrine basins. By fully investigating the regional geological background and combining with the core, logging, earthquake, analysis and laboratory data of the first section of Yongan area, it is considered that Dai member is in the early stage of fault depression, and the topography is relatively smooth. The water body is shallow and fluctuating frequently, the climate is warm and humid, the supply of provenance is sufficient, and it has the favorable sedimentary condition to form shallow water delta. The shallow water deltas in the study area are near-source sediments dominated by traction drainage strong hydrodynamic sedimentary structures in sandstone vertical progressive and accreted sedimentary sequences with parallel sub-parallel and imbricate seismic reflection characteristics. The front subfacies is the main body, the facies belt is wide, can be divided into inner and outer front deposition, underwater distributary channel constitutes the main skeleton sand body; The variation of sediment accommodation space to sediment recharge ratio (A S) is more important in the process of advancing towards the lake, and the distribution of different types of sand bodies and sedimentary patterns is regular. Based on the above analysis, the sedimentary model of the shallow water delta in the early fault basin has been established. To a certain extent, it is of great significance to enrich the sedimentology of shallow water delta and expand the field and scope of oil and gas exploration in Yongan area and even in the slope belt of Gaoyou Sag.
【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;中國石化勝利油田勘探開發(fā)研究院;中海石油(中國)有限公司上海分公司;中海油田服務(wù)股份有限公司;中國石化江蘇油田分公司試采一廠;
【基金】:國家科技重大專項(xiàng)(2011ZX05009-003)~~
【分類號】:P618.13
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