关键词: 东营断陷盆地, 浊积砂体, 排烃强度, 储集属性, 成藏动力指数, 油气充满度

Abstract: Turbidity sand widely developed in the deposit center of Dongying faulted basin is closely related to source rocks and favorable to form lithologic reservoir. But it is difficult to quantitatively predict oil-gas-bearing property in turbidity sand. The characters of plentiful reservoir proved to be turbidity sand reservoir by drilling were analyzed. In combination with tested and simulated data, the key factors controlling reservoir-forming in turbidity sand were discussed. A threshold value of relative indexes for evaluating oil-gas-bearing property was given. The results show that expulsion intensity of hydrocarbon in surrounding rock is the most important factor of reservoir-forming. If hydrocarbon resource rock is abundant in turbidity sand, the main factors affecting the oil-gas-bearing property include reservoir property, drive force and resistance force of reservoir-forming. The surrounding rock with an hydrocarbon-expulsion intensity greater than 200 thousands of tons per square kilometer and the dynamic reservoir-forming index greater than 0.15 is favorable to form the reservoir with high-fullness hydrocarbon, while the turbidity sand with thickness less than two meters and porosity less than 12 % is unfavorable for reservoir formation.

Key words: Dongying faulted basin, turbidity sand, expulsion intensity of hydrocarbon, reservoir properties, reservoir-forming dynamic index, hydrocarbon fullness