APPLICATIONS OF HIGH-RESOLUTION FORMATION MICROSCANNER IMAGE LOGS(FMI)TO HYDROCARBON EXPLORATION IN PANYU B SUB-SAG, PEARL RIVER MOUTH BASIN AND ITS IMPLICATIONS
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摘要:
由于番禺B洼钻井数量较少，加之已钻井揭示古近系含砂率高，且受限于三维地震资料尺度和分辨率，导致对深层古近系诸如沉积相、井旁构造及物源等等各种地质问题缺乏深入了解。鉴于FMI成像测井技术在解决诸多地质问题中的优异表现，在研究区进行了应用, 得到了4项研究成果：准确识别出了恩平组、珠海组和珠江组的岩石类型、沉积构造类型和沉积环境；在古近系地层中识别出了大量的微断层、高阻缝和高导缝; 获得了交错层理倾向的统计数据；得到井旁现今最大水平主应力方向。此外，还获得了2点启示：推测FMI图像上解释出的微断层和微裂缝促进了油气在深层的垂向输导，非常合理地解释了成藏事实；该井古近系储层在埋深较大的情况下也能有较好的物性。简而言之，由于此次FMI成像测井在番禺B洼的成功应用，取得了丰富的成果和有益的启示，这些有价值的资料将大大降低今后勘探的地质风险，极大推动了该区古近系的勘探进程。
Abstract:There are a few drilling holes in the Panyu B Sub-sag and the quality of 3D seismic data are constrained by the Paleogene sand deposits. All of these resulted in the lack of in-depth understanding of the Paleogene geology there, such as sedimentary facies, provenance and near-borehole structures, etc. In view of its excellent performance in solving various geological problems, FMI logging technology was utilized to this region for the first time. Based on FMI data, four achievements are gained: (1) Lithology, sedimentary structures and sedimentary environments are accurately recognized and classified for the Enping, Zhuhai and Zhujiang Formations; (2) Many micro faults, resistive fractures and conductive fractures are identified in the Paleogene; (3) The dip direction of cross beddings are measured; (4) The direction of present maximum horizontal principal stress is acquired. It is further inferred that (1) The interpreted micro faults and fractures from FMI images may act as the paths for vertical migration of oil and gas, and are thus beneficial for oil and gas accumulation; (2) The Paleogene strata have good porosity and permeability even under great buried depth. In a word, owe to the successful application of the FMI logging, fruitful results and helpful inferences are acquired. The findings of this research will greatly mitigate the risks in oil and gas exploration in the region.
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