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歧北中斜坡夹持在滨海断层和南大港断层之间,为一西抬东倾的长期发育的斜坡构造,主要含油目的层为古近系沙河街组的沙二段和沙三段,由于该斜坡受多物源沉积体系控制,砂体平面变化大,岩性油气藏十分发育。含油气面积和有效厚度是歧北中斜坡岩性油气藏探明储量计算的关键参数,以地质规律、模型正反演研究为指导,在储层地球物理特征分析的基础上,通过多轮次滚动精细拟波阻抗反演技术开展含油气砂体的储层预测研究,准确把握了砂体的含油气范围及油气层厚度;充分利用钻井取心、录井、试油、分析化验等资料开展有效厚度下限研究,确保了储量计算过程中有效厚度确定的准确性,关键储量参数的确定方法应用于探明储量计算中,为岩性油气藏储量研究提供了思路。
The Qibu middle slope is sandwiched between the Binhai fault and the Nantangang fault and is a long-term slope structure with west-easterly dip. The main oil-bearing target layer is Sha-2 and Sha-3 sections of Paleogene Shahejie Formation. The slope is controlled by a sedimentary system of multi-source rocks, and the plane of the sandstone varies greatly. Lithologic reservoirs are well developed. The area and effective thickness of oil-bearing gas are the key parameters for the calculation of proved reserves of medium-slope lithologic reservoirs in Qibei. Based on the analysis of geophysical characteristics of the reservoir and geophysical and model inversion studies, Rolling precision quasi-impedance inversion technique to carry out reservoir prediction research on oil-bearing gas sandbodies, and accurately grasp the range of oil and gas bearing sand bodies and reservoir thickness; make full use of drilling coring, logging, oil testing, analysis and other data The study on the lower limit of effective thickness ensures the accuracy of determining the effective thickness in the calculation of reserves. The determination of key reserves parameters is applied to the calculation of proven reserves, which provides a way for the study of reserves of lithologic reservoirs.