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燕辽裂陷带冀北坳陷中元古界(1 800~1 327 Ma)具有高于庄组黑色泥晶白云岩和洪水庄组黑色页岩2套烃源层,以及龙潭沟、双洞、卢家庄3处下马岭组底部沥青砂岩古油藏。沥青砂岩含有2期固体沥青组分:早期沥青组分反射率R_b值1.68%~2.52%;晚期沥青组分R_b值0.81%~1.01%。辉长辉绿岩岩床的侵位,导致早期古油藏蚀变成沥青砂岩;岩床围岩蚀变带的稠油油苗,提供岩浆冷凝后晚期石油充注的证据。沥青砂标志下马岭组底砂岩成岩作用初期(1 400 Ma),业已开始石油早期充注成藏过程;依据辉长辉绿岩侵位时间1 327 Ma,可厘定底砂岩古油藏的蚀变年龄。基于层序地层厚度分析,确定古油藏早期成藏的油源来自高于庄组烃源层,生烃门限深度约3 600 m;洪水庄组烃源层充注成藏时间应在中生代。冀北坳陷雾迷山组、铁岭组等液体油苗和下马岭组沥青砂岩晚期沥青的可溶烃组分源自洪水庄组烃源层。
The Neoproterozoic (1,800-1,327 Ma) in the north Hebei depression of the Yanliao rift zone has two sets of hydrocarbon source rocks, namely, the Upper Devonian black-devided dolomite and the Hongshuangzhuang black shale, as well as the Longtan ditch, , Lujiazhuang 3 at the bottom of the Lower Paleolithic asphalt sandstone reservoir. The asphaltic sandstone contains 2 solid bitumen components: R_b value of early bitumen component is 1.68% ~ 2.52%; R_b value of late bitumen component is 0.81% ~ 1.01%. The emplacement of the gabbro bed has resulted in the alteration of early paleo-oil reservoirs into asphaltic sandstones; the heavy-oil oil-bearing sands of the bedrock alteration zone provide evidence of the late oil charge after magma condensation. Asphaltic sand marks the initial sandstone diagenesis (1,400 Ma) of the Lower Maling Formation and has already started the early oil filling and accumulation process. Based on the emplacement time of the gabbro diabase, which is 1 327 Ma, the alteration of the bottom sandstone reservoir can be determined age. Based on the sequence stratigraphic thickness analysis, it is determined that the early oil accumulation in the ancient reservoirs came from the Gaoyuzhuang hydrocarbon source, with a hydrocarbon generation threshold depth of about 3 600 m. The hydrocarbon source reservoir of the Hongshuangzhuang formation should be recharged in the Mesozoic. The soluble hydrocarbon components of the late Miqimushan Formation, Tieling Formation and other late Tarim bitumens in the Xiamaling Formation originate from the source rocks of the Hongshuangzhuang Formation.