论文部分内容阅读
勘探目的碳酸盐岩沉积盆地的勘探目的可以包括寻找构造和地层圈闭。生油层可以是碳酸盐岩本身,也可以是以碳酸盐岩为主的页岩层。研究的勘探深度决定于地层现在的深度,地层曾经埋藏的最大深度以及地热梯度历史。对石油勘探而言,研究深度大约为1500米至3000米。碳酸盐岩储油层的孔隙,可能由以下几种原因形成: ·被覆盖的礁体或壳坝的原始孔隙。·白云岩中的石灰岩的转化,可能使孔隙度增加10％左右。·二氧化碳和水(H_2CO_3)的作用溶解碳酸盐岩。油的熟化(maturation)产生了二氧化碳,也是导致产生孔隙的原因。
Exploration Objectives Carbonate sedimentary basins may be explored for structural and stratigraphic traps. The oil reservoir can be carbonate itself or it can be a carbonate-based shale. The exploration depth of the study depends on the current depth of the strata, the maximum depth of the strata once buried, and the history of the geothermal gradient. For oil exploration, the study depth is about 1,500 to 3,000 meters. The porosity of carbonate reservoirs can be caused by several reasons: • The original porosity of the covered reef or shell dam. Limestone conversion in dolomites may increase porosity by about 10%. Carbon dioxide and water (H 2 CO 3) dissolve carbonate rocks. Maturation of the oil produces carbon dioxide and is the cause of porosity.