新疆准噶尔盆地南缘中段霍尔果斯背斜“源—盖”匹配关系研究

摘要

The method of rebuilding the source rock's hydrocarbon generation history and mudstone cap-rock's displacement in pressure history have been used for researching "source-cover" coupling and ensuring the mudstone cap-rock's validity of closed dynamic.The research result of the mudstone cap-rock's is close to class of Well 001 at Horgos anticline zone.The middle of the southern margin of Junggar Basin indicates that the maximum displacement pressure of the mudstone cap-rock of Horgos anticline Donggou group will achieve 3.76 Mpa.So,it has the ability to cover the oil,but the matched relationship of "source-cover" is not ideal.The mudstone cap-rock of Donggou group begins to have the ability to cover the oil at Mid-Paleogene (the displacement pressure is above 1 Mpa),but source rock of the Lower Jurassic will produce hydrocarbons at Late Cretaceous.The mudstone cap-rock of Donggou group can only cover the source rock of Lower Cretaceous Tugulu groups.%采用重建烃源岩生烃史(“源”)和泥质盖层排替压力演化史(“盖”)的方法,研究“源—盖”动态匹配关系,以确定泥质盖层封闭动态有效性.针对新疆准噶尔盆地南缘中段霍尔果斯背斜霍001井泥质盖层封闭性的研究结果表明:霍尔果斯背斜上白垩统东沟组泥质盖层最大排替压力达到3.76 MPa,具备封盖油的能力,但“源—盖”匹配关系不理想,东沟组泥质盖层在古近系中期开始具备封盖油的能力(排替压力达到1 MPa以上),但中下侏罗统烃源岩在白垩系末期已经开始生烃,东沟组泥质盖层只具备对下伏下白垩统吐谷鲁群组烃源岩的封盖能力.