Tectonic-sedimentary features of the Shahejie Formation in Chengbei Sag and its implications for oil and gas exploration
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摘要:
通过三维地震、岩芯、测井、录井资料，以“源-沟-汇”思想为指导，分析了埕北凹陷沙河街组构造断裂体系演化及其沉积响应特征，梳理了不同构造演化阶段沉积体系发育类型与时空展布。研究表明，沙河街组沉积期埕北断层、埕子口断层具有典型幕式构造演化特征。沙三段沉积期表现为强烈断陷幕，埕北断层活动强烈，陡坡带沿大型古沟谷发育扇三角洲沉积体系；西斜坡沿断槽型沟谷发育三角洲沉积体系；沙二—沙一段沉积期为走滑改造断陷幕，埕北断层活动明显减弱，埕子口断层活动相对较强，陡坡带和西斜坡沿物源通道均继承性发育三角洲沉积体系。勘探实践验证了砂体发育区为构造-沉积响应的结果，为研究区油气勘探指明方向。
Abstract:Based on three-dimensional seismic, core, logging, and logging data, guided by the "source-valley-sink" concept, the evolution of the structural fault system in the Shahejie Formation and its sedimentary response characteristics in the Chengbei Sag were analyzed. The development types and spatiotemporal distribution of sedimentary systems in different stages of structural evolution were clarified. Results show that the sedimentation of the Shahejie Formation was controlled by the Chengbei Fault and Chengzikou Fault, reflecting typical episodic structural evolution characteristics. The sedimentation period of the third member of the Shahejie Formation is characterized by strong faulting and subsidence, during which the activity of the Chengbei Fault was strong. A fan delta sedimentary system was developed in steep slope zone along a large ancient valley, while a delta sedimentary system was developed in the western slope along a fault-trough-typed valley. The sedimentary period from the first to second members developed a strike-slip-fault depression, during which the activity of the Chengbei Fault was significantly weakened, and that of the Chengzikou Fault remained relatively strong. The steep slope zone and the western slope both inherited the development of the delta sedimentary system along material supply route. The exploration practice has verified that the sand-body development area was resulted from the structural sedimentary response, indicating the direction for oil and gas exploration in the study area.
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Key words:
- Chengbei Sag /
- Shahejie Formation /
- structural evolution /
- sedimentary system /
- oil and gas exploration
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