声波时差指示排烃  

Hydrocarbon expulsion showed by acoustic travel-time curves

作　　者：陈安定[1] 冯武军[1] 

机构地区：[1]中国石油化工股份有限公司江苏油田分公司地质科学研究院,江苏扬州225009

出　　处：《复杂油气藏》2010年第1期1-5,共5页Complex Hydrocarbon Reservoirs

基　　金：中国石油化工股份有限公司(项目编号P05004)

摘　　要：通过苏北盆地各类泥岩—生油层、非生油层、成熟生油层和未熟生油层泥岩声波时差曲线的对比研究,明确凡泥岩均可形成异常压力或欠压实,而欠压实特征的消失,即异常压力释放却只限于成熟烃源岩。分析认为,成熟生油层的异常压力所以能释放,主要因为它有不断增加的烃类流体,流体增压导致岩石破裂并排出流体;非生油层泥岩和未熟烃源岩泥岩的异常压力之所以不能被释放,主要因为它们没有或尚未产生足够数量的流体增压并导致岩石破裂。声波时差"曲线下滑"已成为观察生油层排烃的一项重要标志。In comparision with acoustic travel - time curves of various mudstones, which include source rock, non - source rock, mature source rock, and immature source rock, it is clear that all mudstones can build up abnormal pressure or under - compaction, but only characteristics of under - compaction of mature source rocks can disappear, in other words, abnormal pressure of the mature source rocks can release. The reason can be explained that when hydrocarbon liquids con- tinually flew into the mature source rocks, pressure inside the rocks was increased and burst the rocks, and hydrocarbon liq- uid was expulsed from the rocks. The non - source rock and immature source rock do not have or can not create enough a- mount of hydrocarbon liquid to increase pressure inside the rocks, and cause rock burst. The downslide of the acoustic trav- el - time curve became an important mark to observe hydrocarbon expulsion of source rock.

关 键 词：声波时差 异常压力 欠压实 排烃 初次运移 生油层 成熟烃源岩 苏北盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]