洪浩尔舒特凹陷油气藏形成条件与勘探实践

HYDROCARBON RESERVOIR FORMING SETTING AND EXPLORATION PRACTICE IN HONGHAOERSHUTE SAG

洪浩尔舒特是近年来二连新区勘探高速度、快节奏取得重要突破的一个凹陷。研究表明 ,该凹陷具有阿尔善组、腾一段两套有效烃源岩 ,阿尔善组、腾一段是主要储油层系 ,腾二段是重要含油层系 ,斜坡带上的鼻状构造、洼中的反转背斜、陡带断鼻是油气聚集的主要场所。储油岩主要为扇三角洲、水下扇沉积的岩屑砂岩、含砾砂岩 ,富含火山碎屑成分 ,凝灰质、高岭石粘土含量高 ,储层物性差 ,油层易受污染 ,油层保护是获得油气勘探突破的重要保障 。

Honghaoershute is a sag that the important progress has been achieved during the high speed exploration in Erlian New Area in recent years. Geological research and exploration practices indicate that the sag is of Aershan formation and Teng1 member of 2 sets of effective hydrocarbon source rocks. Aershan formation and Teng1 member are main oil reservoir sequences and Teng2 member is an important oilbearing sequence. Nose structures in the slope belt, reversal anticlines in the pothole and rupture noses in the cliff are main oilgas accumulation place. Oil reservoir rocks are detritus sandstone and gravelbearing sandstone of fandelta and subsea fan deposits, which are pyroclastic rich, tuffaceous and kaolinic clay content high, reservoir physical properties poor, and reservoir pollution easy. Reservoir protection is very important for getting the exploration progress. Fracturing is an important method for high production.