摘要
应用断裂三维定量构造几何学和不同时期断裂活动多参数-走向长度关系分析方法,对珠三南断裂几何特征、形成演化、分段和连锁、活动强度的差异及其对沉积中心迁移的控制,进行较细致和定量的研究。珠三南断裂总体分3大段:东段、西段北支和西段南支,依次细分为2小段、4小段和3小段,各段几何特征和活动差异较大。早期,断裂自西向东分段延伸发育;中期,西段南支活动停止、西段北支和东段强烈差异活动下连锁;晚期,断裂自西向东分段停止活动。整个断裂体系随断裂"弱→强→弱"活动特征,呈"分→合→分"的演化状态。沉积中心随断裂活动强度差异变化表现为"跷跷板式"的迁移规律:古新世在文昌C凹陷的西部→始新世—渐新世早、中期在文昌A凹陷→渐新世晚期在文昌B凹陷的西部→渐新世以后不受断裂控制。
Geometric features, formation and evolution, division and linkage, and active intensity differential of Zhu-3 south fault and its control on the depocenter shift in Zhu-3 depression were investigated in detail and quantitatively by applying the 3-D quantitative structure geometry of faults and analysis of multi-parameters and strike length of fault activity at different stages. The fault has three major segments:the eastern one, western north one and western south one, each can be further divided into 2, 4 and 3 sub-pieces, respectively. Geometric features and activities of each segment were quite different at various stages. For instance, at the early stage, the fault extended by pieces from west to east; at the middle stage, the western north one and eastern one linked under a strongly differential movement while the western south one stopped; and at the late stage, the fault stopped from west to east by pieces. The entire fault system characteristic of "weak -〉strong -〉 weak" activities experienced a "division -〉 linkage -〉 division" evolutionary episode correspondingly. The depocenter showed a "teeterboard"-type shift rule with variances in active intensity of the fault, i.e. from the western Wenchang-C sag in Paleocene to Wenchang-A sag in Eocene and early-middle Oligocene, then to the western Wenchang-B sag in late Oligocene, and with no fault control after Oligocene.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2012年第5期807-813,共7页
Acta Petrolei Sinica
基金
国家重大科技专项(2009ZX05009-002)
国土资源部海洋油气资源与环境地质重点实验室基金(MRE201114和MRE201121)资助
关键词
珠三坳陷
珠三南断裂
多参数-走向长度分析法
几何学
形成演化
分段连锁
沉积中心迁移
Zhu-3 depression
Zhu-3 south fault
analysis of multi-parameters and strike length
geometry
formation and evolution
division and linkage~ depocenter shift