储层精细研究技术在老区挖潜中的应用——以黄骅坳陷板南油区为例

APPLICATION OF REFINED RESERVOIR CHARACTERIZATION TO RELEASING POTENTIAL OF WELL-DEVELOPED OIL FIELDS:TAKING BANNAN AREA OF HUANGHUA DEPRESSION AS AN EXAMPLE

黄骅坳陷板南油区已进入开发中后期,寻找储量接替区是目前面临的重要问题。针对该油区断裂复杂、小幅度构造发育、储层薄而且变化快的特点,提出了储层精细研究的技术思路,旨在通过地震约束的等时小层对比、斜井空间校正、井震三维空间标定、小波域地震相干技术和真三维地震精细解释,解决小断层、小断块和微构造,和通过沉积相研究和岩性反演,解决单砂体的空间展布问题。运用该项技术的结果表明,本区油气受构造和岩性双重控制,层间构造发育,微构造、小断块内断层附近区域和前期解释遗漏的油砂体是增储上产的3个主要领域。根据该项研究成果在板南油区布署的3口井(B21-3井、B21-4井和N5-6井)均获得高产油气流,表明该项技术在开发中后期油田增储挖潜中具有推广价值。

The Bannan Oilfield is on its later stages of development, new discovery of oil potential is inevitably the most reliable way in sustaining its historical importance of production. A refined technique portfolio is developed to achieve a better understanding of reservoirs featuring heavily faulted, low relief, thin beds with narrow lateral extension. The problems arising from the recognition of micro-faults, tiny blocks, and micro-structures are tackled in this paper through a series of techniques as. seismic aided genetic correlation, slant well trajectory calibration, 3D seismic-well tying, wavelet domain coherence and true three-dimensional seismic based structural modeling. The spatial extension of individual sand bodies is delineated based on micro-facies analysis and lithological inversion. The study shows that the distribution of oil and gas accumulations is governed by both structural features and lithological variations. Sub-bed group structures are well developed. These micro structures, together with the fault proximity regions and the previous undiscovered oil-bearing sand bodies contribute to the major sustaining potential. The promising oil and gas flows of the 3 wells drilled based on this study are prudently advertising the remarkable value of this technical practice in extending the life of developed oil fields.