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近年来运用物探方法开展直接找油已在国内外引起越来越大的重视,这种情况的出现并不是偶然的。随着石油勘探形势的发展,一方面发现的构造越来越多,然而,国内外大量实践经验证明,大约只在占全部构造的三分之一中获得了工业油流;另一方面非构造油藏越来越占有更大的比重,例如在美国,这类油藏的储量已占到总地质储量的三分之一。这样就不能单一寻找油气藏的构造标志,还需要寻找油气藏的非构造标志。从目前来看,这种非构造标志有两大类。第一类利用的是油气藏本身与围岩的物性差异所引起的地球物理场异常;第二类利用的是油气藏上覆岩层物性变化所产生的地球物理场异常,这种物性变化常常是由油气藏的后生地质地球化学作用产生的。由于油气藏的构造标志是间接性的,相对而言,就把后两种非构造标志都看成是直接性的。当然,第一类非构造标志的直接性更大一些,但是,
In recent years, the use of geophysical exploration methods to direct oil has attracted more and more attention at home and abroad, the emergence of such a situation is not by accident. With the development of oil exploration, on the one hand, more and more structures are found. However, a large number of domestic and foreign practical experiences have proved that the industrial oil flow is obtained only in one third of the total structure; on the other hand, More and more reservoirs occupy a greater proportion, for example in the United States, the reserves of such reservoirs already account for one third of the total geological reserves. This can not be a single search for the structural markers of oil and gas reservoirs, but also need to find non-structural signs of oil and gas reservoirs. For now, there are two broad categories of such non-structural indicators. The first type utilizes the geophysical field anomalies caused by the differences in the physical properties of the reservoir itself and the surrounding rocks. The second type uses the geophysical field anomalies caused by the physical property changes of overlying strata in the oil and gas reservoirs. The physical property changes are often Produced by epigenetic geo-geochemical effects of oil and gas reservoirs. Since the structural markers of reservoirs are indirect, relatively speaking, the latter two non-structural markers are all considered as direct. Of course, the first category of non-structural markers is more direct, however,