黄骅坳陷埕北断阶带油气成藏系统

黄骅坳陷埕北断阶带油气成藏条件良好,油气勘探潜力很大.油气藏形成的主要控制因素为:充足的油气源;浅层的有效圈闭;有利的储盖组合;晚期活动、可连通油源和新近系圈闭的断层输导体等.3套成藏子系统中,明化镇组沉积末期的沙三段成藏子系统成藏期晚、保存条件好、展布范围大,其新近系储集条件好,油气富集程度高,其古近系由于埋藏深,储集条件相对较差,但勘探潜力巨大;明化镇组沉积末期沙一段成藏子系统成藏期晚,保存条件好,且多形成自生自储油气藏,但成藏子系统范围较小.综合分析认为,张东东构造带、张东构造带、友谊构造带等为古近系Ⅰ类勘探目标区;庄海12井-庄海9×3井地区、埕海4井地区、刘官庄构造南地区等为新近系Ⅰ类勘探目标区.图5表1参11

Pool-forming system of Chengbei fault-step zone in Huanghua Depression

Chengbei fault-step zone is in condition of pool-forming, and has various traps and excellent petroleum exploration potential. The key pool-forming factors are as follows: enough oil and gas source; effective shallow traps; advantaged reservoir and seal combination; late activity faults linking source and traps of Neogene System, etc. Among the three sets of pool-forming sub-system, the Sha 3 member in the late depositional stage of Minghuazhen Formation has a late pool-forming stage, good conservation conditions, large distribution areas, good reservoir and high content of oil in the Neogene, and huge exploration potential in the Eogene System. The Sha 1 member pool-forming sub-system is characterized by hydrocarbon reservoirs of self-source and self-reservoir, but its oil-bearing area is limited. Prospective target areas are the Zhangdongdong structural, Zhangdong structural and Youyi structural belts in the Eogene System,and the Zhuanghai 12-Zhuanghai 9×3 well areas, Chenghai 4 well areas and the southern Liuguanzhuang structural belt in the Neogene System.