Title: Forming mechanism of lithologic reservoirs in Dongying sag
Abstract: Dongying sag has been of exploration stage aimed to lithologic reservoirs, so it s necessary to study forming mechanism of lithologic reservoir in detail. Source rocks in the third member stratum of Shahejie Fomation of Dongying sag have fluid superpressure. Whether sand lens reservoirs among source rock that can form lithologic reservoirs lies on the location between power and resistance force of oil accumulation. Suplus pressure in the wall rock outside resource rock is power of oil accumulation, breaking pressure around sandstone is resistance force of oil accumulation. Reservoir forming index is defined as a parameter of the ratio of reservoir forming power over the reservoir forming resistance, which can be used to evaluate condition for forming lithologic trap. Exploration of lithologic oil reservoirs proves that the relation between reservoir forming index and oil-bearing extent is in positive correlation. Evaluating lithologic trap by using the reservoir forming index is more scientific and preciser than suplus pressure in the wall rock or breaking pressure.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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