CAJ | 학술논문

蚌湖向斜带位于潜江凹陷中部，其潜江组普遍发育超压系统.综合超压成因机理的各种分析方法，基于测井曲线特征和烃源岩成熟度特征，从压实不均衡和生烃作用两方面对蚌湖地区的超压成因机理进行了系统分析.研究结果表明，①在超压段泥岩声波时差曲线偏离正常压实线，其拐点深度为2150~3180 m，蚌湖地区储层实测超压顶界面深度约为2200 m，在埋深较浅地区，超压成因以不均衡压实作用为主，在埋深较大地区，超压成因为不均衡压实和生烃共同作用；②超压顶界面埋深与生烃门限表现出较好的一致性，在2200 m深度其镜质体反射率Ro值为0.55%，说明生烃作用对蚌湖地区超压的发育亦具有一定的贡献，由此认为，压实不均衡和生烃增压作用是蚌湖地区超压发育的主要机理.
방호향사대위우잠강요함중부，기잠강조보편발육초압계통.종합초압성인궤리적각충분석방법，기우측정곡선특정화경원암성숙도특정，종압실불균형화생경작용량방면대방호지구적초압성인궤리진행료계통분석.연구결과표명，①재초압단니암성파시차곡선편리정상압실선，기괴점심도위2150~3180 m，방호지구저층실측초압정계면심도약위2200 m，재매심교천지구，초압성인이불균형압실작용위주，재매심교대지구，초압성인위불균형압실화생경공동작용；②초압정계면매심여생경문한표현출교호적일치성，재2200 m심도기경질체반사솔Ro치위0.55%，설명생경작용대방호지구초압적발육역구유일정적공헌，유차인위，압실불균형화생경증압작용시방호지구초압발육적주요궤리.
Banghu syncline is located in the center of Qianjiang depression,and overpressure distributes widely in the Qianjiang formation. The overpressure mechanism in the Banghu area is studied by two aspects which are the compaction disequilibrium and hydrocarbon generation. The result indicates that the Qianjiang formation of Banghu area shows a compaction disequilibrium situation where mudstone acoustic time curve presents a diverge compared to the normal line,with the inflexion depth between 2150~3180 m. Meanwhile,the measured top depth of overpressure is under 2200 m. This verifies that the compaction disequilibrium causes the overpressure in the area. On the other hand,there is a good coherence between the top depth of the overpressure and the hydrocarbon generation fastigium , and the Ro is 1.0% at the depth of 3200 m,which verifies the contribution of the hydrocarbon generation to the overpressure development. Therefore,it can be concluded that hydrocarbon generation and the compaction disequilibrium are the main mechanism of the overpressure development.