九十年代华东地区油气勘查领域的展望

当前找油气的难度越来越大,要发现新的油气田,必须充分运用成油气有关理论和找油气的有关重要观念。为此,作者首先总结归纳了六个方面的成油气理论和六个方面的找油气重要观念。根据这些理论和观念,结合过去的实践,针对华东地区的地质特点,提出了三个方面的找油气新思路(对华东地区而言)和相应的七个找油气领域。1.多源多期生烃,多期成藏,晚期最利:①与海相中、古生界烃源有关的领域;②浅层天然气(包括第四系生物气);③华东中、小盆地;④东南沿海诸省火山岩覆盖区。2.早期或多期生烃成藏,油气被成岩演化后封闭或地层吸附,经改造后可以开发利用的:⑤煤层气;⑥龙潭煤系中的致密砂岩含油层。3.老领域,新应用(用新理论、新观念、新技术),仍可找到油气:⑦苏北陆相中、新生代盆地。以上作为华东地区九十年代的油气勘查领域的展望。 

PETROLEUM PROSPECTINGS IN THE AREAS OF THE EAST CHINA DURING THE TIME OF 1990s

Nowadays,it becomes more and more difficult to explore for oil and gas. In order to discover new oil/gas fields, the relative theories of petroleum generation and principal concepts for oil/gas cxloration must be used,of which the author concluded in six aspects of topics. Combined these topics with the past practices and the characteristics in the areas of the East China,the new considerations in three aspects with seven new realms of oil/gas exploration in the areas have been proposed in this paper. The new conciderations in three aspects arc as follows; Ⅰ.The hydrocardons generated from multiple sources during polystages and oil/gas pools formed in various geological stages,and the later geological stage it is,the more favourable for the formation of oil/gas pools it will be. Ⅱ. The hydrocarbons generated and oil/gas pools formed in early geological stage or through the polystagcs,and the hydrocarbons have been scaled or absorbed by the formations after the diagen csis took place. Those oil/gas pools are favourable for petroleum development if the geological reworks have occurred. Ⅲ. New discoveries of oil/gas fields can be made in the highly explored areas by applying new petroleum theories,concepts and techniques. The seven new realms for oil/gas prospcctings are as: 1. The hydrocarbons derived from the Mcsozoic and Paleozoic marine sedimentary sequences; 2. shallow buried natural gas(including the Quaternary biogas) ;3. the middle and small sized basins in the areas of the East China; 4. the areas covered by volcanic rocks in the southeast provinces of China;5. the gas derived from coal measures;6. oil-bearing beds of tight sandstones of the Longtan Formation;7. the Meso-Cenozoic non-marine basins in the northern Jiangsu.