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为了研究同生断层的分段生长特征及其对油气运聚成藏的控制作用,以辽河西部凹陷鸳鸯沟断裂为例,采用最大断距相减法恢复鸳鸯沟断裂古断距,反演其活动历史,同时对比区域地质资料,提出了鸳鸯沟断裂在凹陷东部边缘郯庐断裂所诱导的右旋走滑构造系统影响下,具有右旋张扭的特征,沿其走向由西向东逐渐破裂、分段扩展:西段和中段最先发育于沙四段—沙三段沉积时期,断裂在沙二段—沙一段沉积时期为相对静止,东段在东营组沉积时期新生发育,断裂各段在馆陶组以来连结为一条统一的大断裂.研究结果表明,鸳鸯沟断裂分段生长的古调节带为油气聚集的有利区带:1)古调节带为物源进入凹陷区的优势入口,为油气聚集提供有利的储集砂体;2)古调节带构造变形复杂,发育断层、岩性及复合型油气圈闭;3)古调节带使得断裂下降盘发育横向背斜构造为油气运聚的有利指向区.
In order to study the segmented growth characteristics of syngenetic faults and their controlling effects on hydrocarbon migration and accumulation, taking the Yuanyanggou fault in western Liaohe depression as an example, the maximum fault distance recovery method was used to recover the ancient fault of Yuanyanggou fault and to reverse its activity History and meanwhile contrasting the regional geological data, it is proposed that the Yuanyanggou fault has the dextral torsional deformation under the influence of the right-lateral strike-slip tectonics induced by the Tanlu fault in the eastern margin of the sag and gradually ruptures along the strike from west to east, Segment expansion: The western segment and the middle segment were first developed in the sedimentary period of Sha 4 Member to Sha 3 Member. The faults were relatively still at the depositional stage of Sha 2 Member-Sha 1 Member. The eastern segment was reborn during the sedimentary period of Dongying Formation. The Tao Formation has been linked to a unified large fault.The results show that the ancient adjustment belt of Yuanyanggou fault faulting is a favorable zone for oil and gas accumulation: 1) the ancient regulation zone is the dominant entrance for the source to enter the depression area, Which can provide favorable reservoir sand bodies; 2) the complex tectonic deformation of the ancient regulation belts, the development of fault, lithology and composite oil and gas trap; 3) the ancient adjustment belt makes the development of transverse anticlines of fault depression plate for hydrocarbon migration and accumulation Lee pointed area.