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某一北北东向的大型生油凹陷,区域构造平缓,T_1反射层(相当于下白垩系姚家组顶界)的倾角为1°～2°。以往作过多次物探工作,发现的局部构造极少,断层也很少。一般认为它是一个平缓的,非常简单的二级向斜。1974年以后,以姚家组下部(葡萄花油层)为主要目的层进行详探。葡萄花油层的单层砂岩厚度一般为0.5米～2.0米,砂岩总厚度为7.0～8.0米。砂岩薄,透镜体发育。根据大型二级向斜加透镜体控制含油的概念,布署了3.0～6.0公里方格井和大剖面井网勘探“岩性油藏”。钻探结果,部分剖面井成功率较高,但也有相当一部分剖面井成功率低。曾经出现过这样的现象,两口
A large north-east-facing oil-bearing depression has a gentle regional structure with an inclination of 1 ° ~ 2 ° in the T_1 reflector (corresponding to the top of Yaojia Formation in the Lower Cretaceous). In the past, many geophysical work has been carried out and very few local structures are found and there are few faults. It is generally considered to be a gentle, very simple secondary syncline. After 1974, the lower part of the Yao Group (Putaohua oil layer) as the main purpose of the floor for detailed exploration. The thickness of single-layer sandstone in Putaohua oil layer is generally 0.5-2.0 meters, and the total sandstone thickness is 7.0-8.0 meters. Sandstone thin, lens body development. According to the concept of controlling the oil content by a large secondary oblique lens plus a lens body, 3.0 to 6.0 km square wells and large-area well pattern exploration “lithologic reservoirs” are deployed. Drilling results, part of the section wells higher success rate, but there are also a considerable part of the low success rate of cross-section wells. There have been such a phenomenon, two