冀中霸县凹陷古近系深层油气资源潜力研究

ANALYSIS OF DEEP-SEATED HYDROCARBON RESOURCE POTENTIAL OF PALAEOGENE IN THE BAXIAN SAG, CENTRAL HEBEI PROVINCE

李欣 郑署泓 彭宁 和雅琴 贺淑萍 乔晓霞

Li Xin Zheng Shuhong Peng Ning He Yaqin He Shuping Qiao Xiaoxia

中国矿业大学, 北京 100083 2. 中国石油华北油田分公司, 河北, 任丘 062552

China University of minning & Techonology, Beijing 100083, China 2. Huabei Oilfield Company, Renqiu, Hebei 062552, China

以往认为冀中霸县凹陷主力烃源岩为沙三中下段和沙四上段暗色泥岩.通过兴隆1井的钻探,发现了厚度巨大的沙四中下段暗色泥岩.对该套暗色泥岩详细的地球化学研究表明,其有机碳含量在0.6%~6%之间,热解生烃潜力在0.5~14mg/g之间,有机质类型为Ⅱ2-Ⅱ1型,为中等-好烃源岩,而不是以往所认为的属于品质差的烃源岩.有机质成熟度研究表明,兴隆1井烃源岩成熟门槛为3200m,4700m进入生油高峰阶段,5100m左右进入凝析油、湿气阶段.该井沙四中下段暗色泥岩已经进入凝析油、湿气阶段,并已获得自生自储的原油和天然气,表明该套烃源岩具有生成油气的能力.应用盆地模拟法对霸县凹陷沙四中下段油气资源量进行计算,石油资源量增加2200×104t,天然气资源量增加561×108m3,大大提升了霸县凹陷深层的勘探价值.

Middle and lower Es3 and upper Es4 dark shale was previously considered as the main source rocks in Baxian of Central Hebei Province.Middle and lower Es4 dark shale with great thickness was discovered through the drilling of Well Xinglong-1.It is indicated through detailed geochemical study on this set of dark shale that its organic carbon content is 0.6%～6%,pyrolysis hydrocarbon generation potential 0.5～14mg/g and organic matter type Ⅱ2-Ⅱ1.It is obvious that it is medium-good source rock.It is indicated through organic matter maturity research on source rocks in Well Xinglong-1 that its maturity threshold is at 3200m,oil generation peak at 4700m and condensate and wet gas generation at about 5100m.In Well Xinglong-1,middle and lower Es4 dark shale has entered into the stage of condensate and wet gas.Therefore,this set of source rocks has hydrocarbon generation capacity.Basin simulation approach is used to measure hydrocarbon resource of middle and lower Es4 in the Baxian Sag,and the petroleum resource incremental is 22 million tons and natural gas resource incremental is 56.1 billion cubic meters.Thus,deep layer exploration in the Baxian Sag becomes more important.

https://doi.org/10.11781/sysydz200806600