CAJ | 학술논문

渤海湾盆地黄河口凹陷是小型富烃凹陷，郯庐断裂西支呈SN向穿越，造成目前已经发现的油气藏均与断裂构造活动有关。在采用断层活动速率定量分析断裂活动性的基础上，对古近纪以来黄河口凹陷断裂的发育期次、组合特点、成因机制等进行了研究和探讨。结果表明：新生代黄河口凹陷的断裂发育受控于郯庐断裂带的活动构造体系域；古近纪郯庐断裂右行走滑，则导致EW向伸展伴生断裂发育，形成了伸展构造、走滑构造和走滑-伸展叠加构造样式；由郯庐断裂西支为界的黄河口凹陷不同次洼具有不同的构造活动特征以及油气富集程度，其中东部洼陷主要发育伸展-走滑叠加构造，发育“Y”型和“卷心菜”型构造，最大断层生长指数在沙河街组三段-孔店组沉积期为1.2，其他时期构造活动弱，造成本次洼油气富集程度高；西北次洼主要发育伸展构造，发育“Y”型和地堑型构造，沙河街组三段和东营组沉积期断层生长指数为1.3～1.4，本次洼油气富集程度也较高；西南次洼主要受伸展构造影响，由于底部抬升作用的叠加，造成东营组断层生长指数达到1.9；沙河街组一段及沙河街组二段沉积期断层生长指数达到1.3，构造活动强烈，油气富集程度较差；中央隆起带属于郯庐断裂走滑构造带，发育“Y”型和负花状构造，在沙河街组沉积期断层生长指数为1.2，其他时期构造活动较弱，造成中央隆起带油气富集程度高。
발해만분지황하구요함시소형부경요함，담려단렬서지정SN향천월，조성목전이경발현적유기장균여단렬구조활동유관。재채용단층활동속솔정량분석단렬활동성적기출상，대고근기이래황하구요함단렬적발육기차、조합특점、성인궤제등진행료연구화탐토。결과표명：신생대황하구요함적단렬발육수공우담려단렬대적활동구조체계역；고근기담려단렬우행주활，칙도치EW향신전반생단렬발육，형성료신전구조、주활구조화주활-신전첩가구조양식；유담려단렬서지위계적황하구요함불동차와구유불동적구조활동특정이급유기부집정도，기중동부와함주요발육신전-주활첩가구조，발육“Y”형화“권심채”형구조，최대단층생장지수재사하가조삼단-공점조침적기위1.2，기타시기구조활동약，조성본차와유기부집정도고；서북차와주요발육신전구조，발육“Y”형화지참형구조，사하가조삼단화동영조침적기단층생장지수위1.3～1.4，본차와유기부집정도야교고；서남차와주요수신전구조영향，유우저부태승작용적첩가，조성동영조단층생장지수체도1.9；사하가조일단급사하가조이단침적기단층생장지수체도1.3，구조활동강렬，유기부집정도교차；중앙륭기대속우담려단렬주활구조대，발육“Y”형화부화상구조，재사하가조침적기단층생장지수위1.2，기타시기구조활동교약，조성중앙륭기대유기부집정도고。
Huanghekou depression in Bohai Bay basin is small but hydrocarbon-enriched.The west branch of Tan Lu fault is orientedsouth to north.Based on this,all the oil &gas reservoirs which have been found are closely associated with the structural activities.Moving velocity of the fault is adopted to analysis the fault activity quantitatively.Building further on this foundation,the develop-ment phase,combinations and genetic mechanism of the faults in Huanghekou depression since Paleogene have been most extensivelystudied and discussed.Results indicate that fault evolution in Huanghekou depression in Cenozoic is controlled by the structure activ-ity system tract of Tan Lu fault.Tan Lu fault is dextral strike-slipping in Paleogene,which give rise to the associated fault EWstrike.Whereupon the extensional,strike-slip,and strike-slip extensional superimposed structural styles are formed.In Huanghek-ou depression,of which the boundary is the west branch of Tan Lu fault,different sags have different tectonic activity characteristicsand hydrocarbon accumulation degrees.In eastern sag,there mainly is strike-slip extensional superimposed structure.Suffering thisimpact,Y type and cabbage type structures developed.The maximum fault growth index is 1.2,which appeared in the period fromthe third section of Shahejie Formation to Kongdian Formation.The structural activity is weak in other periods,so the oil and gasaccumulation degree is high.In northwestern sag,there are mainly developing extensional structure,Y type and graben type struc-tures.The fault growth index range of the third section of Shahejie Formation and Dongying Formation is between 1.3 and 1.4.Theoil and gas accumulation degree of this sag is also relatively high.Southwestern sag is mostly affected by extensional structure.A-long with the effect of the bottom uplifting,the fault growth index of Dongying Formation is 1.9.There in the first and second sec-tion of Shahejie Formation develops intensive structure activities.Its fault growth index is 1.3,and the oil and gas accumulation de-gree is lower.In central uplift belt,which belongs to strike slip tectonic belts of Tan Lu fault,there develops Y type and negativeflower structures.The fault growth index in Shahejie Formation is 1.2,and in other periods the tectonic activity is weak,which cre-ates a rich hydrocarbon accumulation in this belt.