Sand body genesis and hydrocarbon accumulation characteristics of the Dongying Formation in the east slope of the Chengdao area, Bohai Sea

doi:10.3969/j.issn.1672-7703.2020.04.004

Abstract

Abstract: The Chengdao oilfield is an important offshore area for reserves increase for Sinopec Shengli Oilfield Company. The Dongying Formation, in the east slope of the Chengdao area, has great potential and has so far been subject to relatively little exploration. The diversity of sand body types in this area makes it difficult to predict their distribution, and hydrocarbon accumulation and enrichment patterns are also extremely varied. This study examines the sedimentary characteristics and control factors of hydrocarbon accumulation in the Dongying Formation to determine the geneses of sand bodies and the main controlling factors of oil and gas accumulation in the area. Results from mud logging, wireline logging, well test, and seismic data show that: (1) The main types of sedimentary facies are the flood sub-lacustrine fans and slump sub-lacustrine fans of the Ed4 sand group of the major oil-bearing series in the east slope of the Chengdao area. (2) The fan bodies are oriented NE along several inherited gullies, controlled by paleogeomorphology and a fault slope break belt. Multi-stage sand bodies overlap each other. Between the gullies, sand reservoirs are relatively isolated. The slope breaks are mostly sand pinch-out zones. (3) The oil reservoirs in the study area are mostly structural-lithologic and lithologic reservoirs—a result of the good configuration relationships between structural factors and sedimentary systems. Large-scale self-generating and self-storage lithologic oil reservoirs are developed in the lower parts of slope breaks towards sag areas. (4) Oil and gas enrichment in the area, and the formation of large-scale reservoirs, are the results of superimposition of multi-stage gravity-flow sand bodies in a deep water environment. Source and reservoir assemblages, faults, and overpressure have ensured that the oil reservoirs in this area benefit for superimposed and contiguous distribution, general enrichment, and high production.

CLC Number:

Song Mingshui. Sand body genesis and hydrocarbon accumulation characteristics of the Dongying Formation in the east slope of the Chengdao area, Bohai Sea[J]. China Petroleum Exploration, 2020, 25(4): 31-42.

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