由于地表泰加林(两伯利亚针叶林)、沼泽等的影响,在西伯利亚西部采用线状布井方式。上侏罗统(J_3)产层中油藏的分带很复杂,这就是90年代早期之前,在两西伯利亚西缘的Shaimsky区每钻三口井就会出现干井的原因。如果在油田范围内采用某些...由于地表泰加林(两伯利亚针叶林)、沼泽等的影响,在西伯利亚西部采用线状布井方式。上侏罗统(J_3)产层中油藏的分带很复杂,这就是90年代早期之前,在两西伯利亚西缘的Shaimsky区每钻三口井就会出现干井的原因。如果在油田范围内采用某些储集岩分区的沉积关系,开发钻井的结果可能会好得多。这些自然因素有:1.古盆地的水深;2.距碎屑物源的距离;3.沉积作用区的近似方位(Proximityof the area of deposition)。使用本文提供的图件,可以避免在砂岩尖灭区、砂岩过渡为泥岩区或砂岩存在的概率很低的地区钻井。展开更多
The map of reflecting horizon A, plotted on the basis of regional geophysical materials, yieldsinformation about the bottom topography of sedimentary cover of the West-Siberian Basin within Nadym-Taz interfluve. Throu...The map of reflecting horizon A, plotted on the basis of regional geophysical materials, yieldsinformation about the bottom topography of sedimentary cover of the West-Siberian Basin within Nadym-Taz interfluve. Through morphotectonic analysis about this surface, the authors are able tounderstand the distribution characteristics of the main topographic irregularities, with the blockstructure of the lower cover floors and underlying complexes as the focus.The largest irregularities are caused by the presence of three regional altitude steps, which show a regional tendency of basement being submerged in the north-north-east direction. Within these irregularities, the authors have distinguished some regions, which can be divided, based on the characteristics of morphostructural distribution, into two groups, i.e., areal (Nadym, Tol'ka, Urengoy)and belt (Tarko-Sale, Russko-Chasel'ka and Messoyakha). The first ones represent quasihomogeneous blocks, whose surfaces are complicated by irregular low-amplitude elevations and troughs and low-gradient zones with gradient values being up to 0.03, or they submerge stepwise, with the leveled areas being separated by zones with high gradients (0.07-0.15). The morphostructure of the other group of regions is characterized by the en-echelon distribution of contrastingly positive and negative elements with high values of slope gradients (higher than 0.1-0.2).展开更多
文摘由于地表泰加林(两伯利亚针叶林)、沼泽等的影响,在西伯利亚西部采用线状布井方式。上侏罗统(J_3)产层中油藏的分带很复杂,这就是90年代早期之前,在两西伯利亚西缘的Shaimsky区每钻三口井就会出现干井的原因。如果在油田范围内采用某些储集岩分区的沉积关系,开发钻井的结果可能会好得多。这些自然因素有:1.古盆地的水深;2.距碎屑物源的距离;3.沉积作用区的近似方位(Proximityof the area of deposition)。使用本文提供的图件,可以避免在砂岩尖灭区、砂岩过渡为泥岩区或砂岩存在的概率很低的地区钻井。
文摘The map of reflecting horizon A, plotted on the basis of regional geophysical materials, yieldsinformation about the bottom topography of sedimentary cover of the West-Siberian Basin within Nadym-Taz interfluve. Through morphotectonic analysis about this surface, the authors are able tounderstand the distribution characteristics of the main topographic irregularities, with the blockstructure of the lower cover floors and underlying complexes as the focus.The largest irregularities are caused by the presence of three regional altitude steps, which show a regional tendency of basement being submerged in the north-north-east direction. Within these irregularities, the authors have distinguished some regions, which can be divided, based on the characteristics of morphostructural distribution, into two groups, i.e., areal (Nadym, Tol'ka, Urengoy)and belt (Tarko-Sale, Russko-Chasel'ka and Messoyakha). The first ones represent quasihomogeneous blocks, whose surfaces are complicated by irregular low-amplitude elevations and troughs and low-gradient zones with gradient values being up to 0.03, or they submerge stepwise, with the leveled areas being separated by zones with high gradients (0.07-0.15). The morphostructure of the other group of regions is characterized by the en-echelon distribution of contrastingly positive and negative elements with high values of slope gradients (higher than 0.1-0.2).
