...键词：地形地貌、地层岩性特点、分布里程、工程地质岩组 [gap=238]Keywords: topography and landforms, rocks characteristics, distribution mileage, engineering geological rock group ..
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在此基础上，结合实例详细探讨了各类油气藏在地层剖面中所处的位置以及其岩性特点、储层物性特征等。
On this basis, the location in stratigraphic sections, lithological features and physical property characteristics of each type oil and gas reservoirs are discussed in detail combined with examples.
在中国陆相沉积地层中，近源砂岩储集层占有相当大的比例，具有岩性变化快、非均质性强的显著特点。
Proximal sandstone, characterized by fast lithologic changing and strong heterogeneity, occupies a large proportion in terrestrial sedimentary formation.
提高绳索取心钻进效率要做到：一是根据孔深、钻孔孔径、钻孔所遇地层及其岩性的完整程度、构造特点、风化带发育深度等选择套管的直径及下入深度；
To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;
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