抄録
One of the most important problems in petroleum geology is time and mechanism of petroleum migration. Since many years ago many geologists have seemed to believe that mechanical compaction (except that in the earliest stage of diagenesis) is the main mechanism of petroleum migration ("theory" of primary migration in early diagenetic stage.) Recently such geochemists and geologists as Powers, Burst, Kartsev et al. insist that interlayer water expulsion from montmorillonite clay is the main mechanism ("theory" of primary migration in late diagenetic stage). This new "theory" is reasonable to some extent, but it cannot explain how the petroleum in carbonate source rocks has migrated into reservoirs,
In this introductory paper I cannot deny these two "theories", because plural "theories" may be consistent in case we study innumerable oil and gas fields in the world that are geologically various. At the end of this paper I propose a few methods of determining time and mechanism of petroleum migration and accumulation.
