济阳坳陷八面河地区古近系孔店组油气成藏特征.docxVIP

学兔兔 www.xuet ut 第32卷 第3期 及由与天然气地人 OIL GAS GEOLOGY 2011 年 6 月 文章编号：0253-9985(2011)03-0352-08 济阳坳陷八面河地区古近系孔店组油气成藏特征 徐义卫 (中国石化江汉油田分公司，湖北潜江433124) 摘要：济阳坳陷八面河地区古近系孔店组具有形成油气藏所需的储层、圈闭和保存条件，但缺少生烃条件。八面河孔店组 油藏具有“低密度、低粘度、低含硫、高含蜡、高凝固点”的特点，与东营凹陷王家岗孔店组原油具有相似性。对比八面河地 区孔店组与沙河街组的原油性质、组分构成及生物标志化合物等地化指标，认为来自东营凹陷沙河街组四段下亚段和孔 店组二段的原油通过不整合面沿由北西向古构造脊与河道砂体构成的优势通道运移至八面河地区，形成以超覆不整合地 层油藏和构造油藏为主体的多种油藏类型。受构造背景、油气输导、储层展布、圈闭分布及断层活动等多种因素控制，孔 店组油气平面上主要分布在八面河鼻状构造带西南端，纵向上多聚集在距不整合面80m 以内的孔店组下部，其油藏具有 充满程度低、规模较小的特点。 关键词：油气输导；油气聚集；油藏类型与分布；孔店组；古近系；八面河地区；济阳坳陷 中图分类号：TE122.3 文献标识码：A Characteristics of hydrocarbon accumulation in the Paleogene Kongdian Formation of Bamianhe area, the Jiyang Depressio n Xu Yiwei (SINOPEC Jianghan Oilfield Company,Qianjiang,Hubei 433124,China) Abstract :The Kongdian Formation in the Bamianhe area has necessary conditions for oil and gas accumulation, such as reservoirs, traps and sealing conditions,but it lacks hydrocarbon generation conditions. Oil in the Kongdian Formation of the Bamianhe area is characterized by low density,low viscosity,low sulfate content, high wax content and high freezing point and can correlate with that in the Kongdian Formation of the Wangjiagang area in the Dongying depression. According to the contrast of geochemical indicators,such as the nature of crude oil,the con- stitution of component and the biomarker between the Kongdian Formation and Shahejie Formation of the Bamian- he area,we believe that crude oil sourced from the lower 4 member of Shahejie Formation(Es4)and the 2d member of the Kongdian Formation(Eh2) of the Dongying depression migrated to the Bamianhe area along uncon- formities and favorable passageways which consisted of the North-west palaeostructure crest and channel sand body. Therefore,a variety of reservoir types were formed with the majority of overlapping unconformity stratigraphic reservoirs and structural reservoirs. Contr