渤海湾盆地饶阳凹陷烃源岩再认识与资源潜力分析

Recognition and resource potential of source rocks in Raoyang Sag of Bohai Bay Basin

饶阳凹陷是渤海湾盆地富油凹陷之一,其中发育的富氢页岩是优质烃源岩,但此前一直被忽视,借鉴南堡油田勘探发现的启示,重新对富氢页岩进行了有机地球化学分析。结果表明,该套烃源岩是任丘潜山大油田的主要贡献者:有机碳含量大于3%,热解生烃潜量平均为24.89mg/g;以无定形体占绝对优势的Ⅱ1型母质为主;主力烃源层下第三系沙三段处于生油高峰阶段。资源复算其生油量为28.61×108t,占凹陷总生油量的27%,从而使饶阳凹陷剩余石油地质资源量增加到7.59×108t。就目前资源探明情况,还存在较大的勘探空间和新的勘探领域,勘探前景乐观。

Raoyang Sag is one of the oil-enriched sags in Bohai Bay Basin. In Raoyang Sag, hydrogen-enriched shale is high-quality source rock, hut it has been ignored. Using the successful exploration experience of Nanpu Oilfield for reference, the organic geo- chemistry features of hydrogen enriched shale were analyzed. It is indicated that this type of source rocks mainly contributes to the large buried-hill oilfield in Renqiu area. The organic carbon content is over 3%. The pyrolysis hydrocarbon-generation potential is 24.89 mg/g averagely. The type of parent material is type 111 with amorphous solid as dominant, and the major source rocks （Es3） is at the stage of hydrocarbon generation peak. The newly calculation of resource shows that the oil generating amount is 28. 61 ×10^8t and accounts for 27% of total oil-generation amount in the sag. Thus remaining oil resource amount reaches 7.59×10^8t in Rao yang Sag. The current exploration situation presents an optimistic prospect for oil and gas exploration.