三塘湖盆地马朗凹陷地层—岩性油气藏勘探实践与认识

通过回顾三塘湖盆地马朗凹陷侏罗系地层—岩性油气藏的勘探历程,系统总结了实践中的关键环节和获得的地质认识。在沉积体系精细研究的基础上,强化老井复查和油藏认识,发现马朗凹陷侏罗系大型地层-岩性油藏,并不断扩展勘探层系。高分辨率层序地层学等技术是勘探取得突破的根本保证,油层压裂改造技术可有效促进预探发现,超前注水增压、压裂投产技术实现有效开发。分析了该油气藏的形成条件和潜力。芦草沟组优质烃源岩控制其分布范围,勘探前景良好;北部地层抬升与南部物源砂体匹配形成岩性圈闭;晚燕山期—喜山期构造运动促成了油气的高效运聚。

PRACTICE AND COGNITION OF FORMATION-LITHOLOGY HYDROCARBON RESERVOIR EXPLORATION OF MALANG DEPRESSION IN SANTANGHU BASIN

By reviewing the exploration history of Jurassic hydrocarbon reservoir of Malang depression in Santanghu basin,this paper summarizes systematically the geological cognition.Based on the fine depositional system,by enhancing well recheck and reservoir recognition,the large Jurassic formation hydrocarbon reservoir of Malang depression was found,and more stratigraphic sequences were explored.High resolution sequence stratigraphy is the fundamental guarantee of the exploration breakthrough.The reservoir fracturing and transformation technique advances preliminary prospecting.The advance boosting water injection technique and fracturing commission technique achieved effective exploitation.The high quality source rocks in Lucaogou formation hosts good exploration prospects.The uplifted north is combined with the southern source sand body to form a lithologic trap.The tectonic movement during late Yanshanian to Himalayan enabled the hydrocarbon migration and accumulation with high efficiency.