BA 1井钻探后对成藏条件的初步探讨

Brief discussion for reservoir forming condition after drilling of Well BA 1.

BA 1井是南华北盆地的一口风险探井,实际钻探过程中K_(1y)油气显示活跃,但经地层改造仍未获得工业油流。针对这一情况,从成藏的角度入手,经过分析多种资料后认为,井区的K_1具有成藏所需的油源条件、圈闭保存条件,未取得突破的主要原因是近源沉积低结构成熟度、低岩石成分成熟度以及成岩作用所致的特低孔隙度、特低渗透率的储集层物性特征等因素。并结合区域资料指出,BA 1井钻探技术未获得工业油气流不能说明所在构造带没有勘探价值,认为K_1仍是该区块最有希望取得突破的目的层系,并对下步勘探提出了建设性建议。

Well BA 1 is a risk exploration well in south Huabei basin,K_(1y) oil and gas show was active during practice drilling, but no commercial oil flow has been obtained after formation reforming.In accordance with such a condition, from the point of the view of reservoir forming and analyzing lots of information,the authors considered that K_1 has oil source condition and trapping preserving condition for reservoir forming,the major reasons for no breakthrough are the features of reservoir physical properties,such as the low structure maturity of proximal sedimentation,the low rock composition maturity and the special low porosity and permeability caused by diageneses.Combined with regional information,the paper pointed out that no commercial oil flow was got by the drilling technology in Well BA1,which did not mean that the tectonic belt had no exploration value, while the authors considered that K_1 is still the most hopeful block target series of strata for breakthrough,and provided constructive suggestions for the next exploration.