PETROLEUM GEOLOGY OF BASALT-SOURCE ROCK PARAGENETIC ASSOCIATION IN BINNAN AREA, THE DONGYING DEPRESSION OF THE BOHAIWAN BASIN

Different scales of basalt was developed in the major hydrocarbon-generating strata of Binnan area, the Dongying Depression of the Bohaiwan Basin, which composed basalt-source rock paragenetic association. In the association, the source rocks which were enriched with organic matter were composed of calcareous argillutite and oil shale lithologically, and the basalt which developed vesicles and solution pores was good re-servoirs. During the long time of burial, the interaction of volcanic material (including transition metals) with organic matter brought about catalysis and hydrogenation in the hydrocarbon-generating process of organic matter, and resulted in the generation of large amount of hydrocarbons at lower temperature. Meanwhile, the basalt underwent intense alteration under the action of organic acids, and formed a great amount of reservoir spaces. Therefore, the basalt-source rock paragenetic association is a very good habitat for oil and gas accumulation.