渤海湾盆地渤中19-6区中-新生代构造转换特征及其对太古宇潜山大规模储层形成的控制作用

doi:10.11743/ogg20220605

Abstract

Abstract:

There are few studies on the relationship between tectonic transformation in North China since the Meso-Cenozoic and the origin of traps and reservoirs in buried hills in the Bohai Bay Basin. The data of core， seismic and thin section observation， coupled with understanding on the regional tectonic background， are applied to clarify the characteristics of the Meso-Cenozoic tectonic transformation in Bozhong 19-6 area and its influence on buried-hill strata， traps and the Archaean reservoirs. It is shown that the buried-hill structure in Bozhong 19-6 area underwent tectonic transformations from the pre-Indosinian to Indosinian， from the Indosinian to Yanshanian and from the Yanshanian to Himalayan under the interaction of North China， South China and paleo-Pacific plates， resulting in four fault systems trending NW， NE， near NS and EW. The NW-trending faults formed in the period of Indosinian tectonism controlled the overall trap and stratigraphic distribution of the Archean and Paleozoic； The NW- and near NS-striking faults developed in the period of Yanshanian movement made the buried-hill traps more complex， and overall structure of the buried hills was finalized with the fault depression in the Himalayan period. Multi-episode tectonic movements are of great significance to the formation of large-scale fractures in the Archean buried hills， and the Indosinian overthrusting was critical to the formation of large-scale fractures in Archean. The Yanshanian tectonic activities further expand the scale of the Archean fractured reservoirs developed， and the Himalayan tectonic transformation has a significant impact on the "reactivation" of early fractures. Multi-stage spatiotemporal tectonic transformation is the key to the development of large-scale reservoirs in the Archean. The correlation mechanism between the Meso-Cenozoic tectonism and origins of buried-hill trap and reservoir in eastern China proposed in this study， provides a more effective method for mapping of buried-hill reservoirs in eastern China， and is of great significance to guiding buried-hill petroleum exploration in similar basins.

Key words: multi-stratigraphic structure, trap genesis, Archean burried hill, structural transformation, Meso-Cenozoic, Bozhong 19-6 area, Bohai Bay Basin

CLC Number:

TE122.2

Deying Wang, Xiaojian Liu, Hui Deng, Yongjiang Liu, Deyu Li. Characteristics of the Meso-Cenozoic tectonic transformation and its control on the formation of large-scale reservoirs in the Archean buried hills in Bozhong 19-6 area， Bohai Bay Basin[J]. Oil & Gas Geology, 2022, 43(6): 1334-1346.

Figures/Tables 12

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Table 1

The Meso-Cenozoic multi-stage tectonic transformation events and characteristics in Bozhong 19-6 area［14-16］"

时期	区域构造运动	区域动力学机制	应力方向与构造性质	构造变形响应	地层组合变化关系	潜山圈闭特征
晚白垩世— 新近纪	喜马拉雅运动	太平洋板块向欧亚板块俯冲	北北西向伸展	早期断层反转并新发育近东西向断层	潜山上部沉积巨厚新生界	潜山圈闭深埋定型
早白垩世末— 中白垩世	燕山运动晚期	古太平洋板块向华北板块俯冲	北西西向挤压	北东向断层反转为逆冲断裂	上白垩统缺失，下白垩统遭受剥蚀	对研究区圈闭影响较小
早白垩世中期	燕山运动中期	古太平洋板块向华北板块俯冲	北西-南东向伸展	北西西、北北东向断层全面伸展	渤中19-6周边地区火山大规模活动，发育厚层义县组火山岩；同时箕状断陷结构形成，沉积九佛堂组、阜新组和沙海组碎屑岩	对研究区圈闭影响较小
早白垩世初期	燕山运动中期	古太平洋板块向华北板块俯冲	北北东向左行走滑	形成北北东向和近南北向走滑断裂	渤中19-6区保持持续抬升，白垩系不发育	渤中19-6南部BZ19-6-B井区发育S型走滑增压型圈闭
中侏罗世末— 晚侏罗世	燕山运动早期	古太平洋板块向华北板块俯冲	北西向挤压	形成大量北东向逆冲断裂	古生界发生再次严重剥蚀	对太古宇、古生界圈闭进行切割，圈闭复杂化
晚三叠世晚期—中侏罗世	印支运动晚期	华北板块北缘古亚洲洋完全闭合，造山后的弱伸展环境	强挤压后的应力松弛	中-下侏罗统沉积	渤中13-2构造和沙南凹陷沉积厚层侏罗系砂、砾岩	渤中13-2太古宇构造下沉，被侏罗系覆盖
早三叠世— 晚三叠世早期	印支运动早期	华北、华南板块碰撞，古特提斯洋由东向西“剪刀式”闭合	先近南北向挤压，后南西向挤压	形成一系列北西向和近东西向逆冲断裂	渤中19-6、渤中13-2构造处于古背斜核部，古生界剥蚀殆尽；渤中21/22处于古背斜翼部，保留部分古生界	渤中19-6构造太古宇圈闭形成雏形

Table 1

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Characteristics of the Meso-Cenozoic tectonic transformation and its control on the formation of large-scale reservoirs in the Archean buried hills in Bozhong 19-6 area， Bohai Bay Basin

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