东海陆架盆地西湖凹陷宁波构造带反转背斜分段差异变形及其油气地质意义

doi:10.11743/ogg20250112

Abstract

Abstract:

The Y-shaped anticline， situated in the Ningbo structural zone， Xihu Sag， has emerged as a focal point in hydrocarbon exploration and assessment in the East China Sea Shelf Basin in recent years. However， the dominant factors controlling the differential hydrocarbon accumulation and favorable exploration targets in this anticline are yet to be clarified. Through fine structural analysis， we investigate the segmented differential deformation of the Y-shaped anticline and controlling factors， as well as its significance on hydrocarbon accumulation. The results indicate that the Y-shaped anticline can be divided into southern， central， and northern segments based on the differences in structural morphology. The secondary anticlines in these segments are governed by various inverted faults， with the central segment exhibiting the most significant compressional uplift. The main factors controlling the differential deformation in the southern and northern segments include regional compressive stress， differences in pre-existing sub-sag-controlling faults， and localized stress concentration induced by rigid basement. In contrast， the central segment experienced uplift overall driven by intense compression and contraction. Consequently， the originally separated secondary anticlines in the southern and northern segments underwent deformation， eventually forming a large anticlinorium featuring disparities in the southern and northern parts. The differential deformation of the southern and northern segments， coupled with the multistage superimposed deformation， results in differential hydrocarbon accumulation in different parts of the Y-shaped anticline. It can be concluded from these findings that the Huagang and Longjing formations contain multiple favorable exploration targets， which will be of great help to gas exploration in the Xihu Sag.

Key words: segmentation, differential deformation, differential hydrocarbon accumulation, inverted anticline, Ningbo structural zone, Xihu Sag, East China Sea Shelf Basin

CLC Number:

TE121.2

Xianjun TANG, Honghao ZHU, Ning LI, Yixin YU, Rongquan ZHONG, Lang YU. Segmented differential deformation of inverted anticlines and its significance on hydrocarbon accumulation in the Ningbo structural zone， Xihu Sag， East China Sea Shelf Basin[J]. Oil & Gas Geology, 2025, 46(1): 167-177.

Figures/Tables 9

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Segmented differential deformation of inverted anticlines and its significance on hydrocarbon accumulation in the Ningbo structural zone， Xihu Sag， East China Sea Shelf Basin

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