渤海海域辽中南洼压扭构造带成因演化及其控藏作用

J4 ›› 2016, Vol. 22 ›› Issue (3): 502-.

渤海海域辽中南洼压扭构造带成因演化及其控藏作用

李伟，陈兴鹏，吴智平，张婧，任健，刘超，李春锐

出版日期:2016-09-20 发布日期:2016-10-09

Study on the Origin and Evolution of Transpressional Structural Belt and Its Control on Oil and Gas Accumulation in the South of Liaozhong Sub-sag, Bohai Sea Area

LI Wei, CHEN Xingpeng, WU Zhiping, ZHANG Jing, REN Jian, LIU Chao, LI Chunrui

Online:2016-09-20 Published:2016-10-09

摘要/Abstract

摘要：

在三维地震资料详细分析解释的基础上，利用水平相干切片和不同方向地震测线对辽中南洼压扭构造带的发育特征
进行了分析，进一步结合地层发育及应力场特征对压扭构造带的成因演化进行了研究，在此基础上探讨了其对油气成藏的
控制作用。结果表明：辽中南洼压扭构造带的形成演化受控于NNE向展布的辽中1号和中央走滑断裂，两条断裂主要表现
为伸展—走滑性质，平面上表现为弯曲的“S”形，且构成左阶排列。辽中南洼的古近纪早期的伸展沉降与后期走滑断裂派
生的挤压应力是压扭构造带形成演化的主要控制因素，古近纪孔店—沙三期辽中南洼伸展沉降，沙三末期的构造变革使得
压扭构造带开始形成，古近纪晚期（Ed）辽中1号和中央走滑断裂表现为强烈的右旋走滑，两条断裂的左阶排列以及中央
走滑断裂的“S”形弯曲在压扭构造带派生出构造挤压应力。此后，古近纪末期东营运动以及新近纪末期渤海运动的构造挤
压对其进行了改造，压扭构造带下凹上凸，古近系东营组和新近系地层弯曲上拱。压扭构造带成藏条件优越，作为主要封
堵断层的中央走滑断裂“S”形外凸增压部位断裂带紧闭、封堵能力强，有利于形成大中型油气藏。

关键词: 压扭构造带；走滑断裂；派生应力；油气成藏；辽中南洼

Abstract:

Based on the detailed interpretation of three-dimensional seismic data, horizontal coherent slices and seismic lines of
different directions were used to analyze the development features of transpressional structural belt in the south of Liaozhong sub-sag.
Combined with the stratum development and stress field, the genesis and evolution of transpressional structural belt was studied and its
control of hydrocarbon accumulation was discussed. The result shows that the origin and evolution of transpressional structural belt are
controlled by the NNE trending Liaozhong 1 Fault and the Central Strike-slip Fault. These two faults mainly show both extensional and
strike-slip features, and occur as a“S”-shaped left-stepped arrangement on the plane. Extensional subsidence during Early Paleogene
and the compressive stress derived from strike-slip fault of Late Paleogene are the main controlling factors of the origin and evolution of
transpressional structural belt in the Liaozhong sub-sag. Extensional subsidence of Ek-Es3 in the Paleogene in the south of Liaozhong
sub-sag and tectonic transformation at the end of Es3 led to the formation of transpressional structural belt. At the end of Paleogene(Ed),
Liaozhong 1 Fault and the Central Strike-slip Fault showed strong dextral strike-slip. During the dextral shear, the left-stepped
arrangement and the“S”shape of central strike-slip fault generated regional compressional stress. After this, the tectonic compression of
Dongying movement at the end of Paleogene and Bohai movement at the end of Neogene reshaped its pattern continuously.Transpressional structural belt showed a convexed top and a concaved bottom, and the strata of the Dongying Group and the Neogene
System became bent to form upward arches. Transpressional structural belt is a favorable area for hydrocarbon accumulation and the
Central Strike-slip fault as the main plugging fault is tightly closed and it is beneficial to lateral sealing at the stress-increasing part of the
"S"-shaped bend, which is an advantageous factor for the formation of large-medium size oil and gas reservoirs.

Key words: transpressional structural belt, strike-slip fault, derivative stress, hydrocarbon accumulation, the south of Liaozhong sub-sag

李伟，陈兴鹏，吴智平，张婧，任健，刘超，李春锐. 渤海海域辽中南洼压扭构造带成因演化及其控藏作用[J]. J4, 2016, 22(3): 502-.

LI Wei, CHEN Xingpeng, WU Zhiping, ZHANG Jing, REN Jian, LIU Chao, LI Chunrui. Study on the Origin and Evolution of Transpressional Structural Belt and Its Control on Oil and Gas Accumulation in the South of Liaozhong Sub-sag, Bohai Sea Area[J]. J4, 2016, 22(3): 502-.