Structural Characteristics of Yudu Strike-Slip Fault Zone and Their Control on Hydrocarbon Accumulation in Southern Ordos Basin
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摘要: 为加深对鄂尔多斯盆地内部走滑断裂结构构造特征的认识，通过相干切片技术和三维地震资料精细解释，对鄂尔多斯盆地南部镇泾-彬长地区玉都走滑断裂带进行了详细刻画，明确了玉都走滑断裂带平面和剖面活动性特征、同时结合流体包裹体定年和前人研究的成果，探讨了玉都走滑断裂带形成演化过程及其与油气成藏的关系.研究表明：(1)根据玉都走滑断裂带平面和剖面特征，以三叠系底界面(T8)为界，可将研究区地层分为上下两个构造层，玉都走滑断裂带在上下两个构造层中具有明显差异.(2)玉都走滑断裂带具有明显的分层分段差异性，断裂活动特征在不同层段之间差别较大.其在加里东-海西期和燕山-喜山期的应力作用下至少经历三期构造走滑活动，分别为加里东晚期-海西早期左旋走滑活动、海西晚期右旋走滑活动、燕山期-喜山期左旋走滑活动.(3)走滑断裂及其伴生裂缝对油气成藏有重要的控制作用，研究区油气成藏主时期为早白垩世晚期，与燕山期玉都走滑断裂带活动时间相吻合.Abstract: In order to improve the understanding of strike-slip fault structure and structural characteristics in Ordos basin, based on the coherent slice and the fine interpretation of the 3D seismic data, in this paper it describes in detail and clarifies the plane and profile activity characteristics of the Yudu strike-slip fault zone in the Zhenjing-Binchang area of the southern Ordos basin. Then, it disscusses its formation and evolution process and its control on hydrocarbon accumulation combined with fluid inclusion dating and previous research results. The study shows follows : (1)According to the plane and profile characteristics of the Yudu strike-slip fault zone, the strata in the study area can be divided into upper and lower tectonic layers by the bottom boundary of the Triassic(T8). The Yudu strike-slip fault zone has obvious difference between the upper and lower structural layers. (2) The Yudu strike-slip fault zone has obvious differences in stratification and segmentation, and the fault activity characteristics differ greatly among different strata. Under the action of Caledonian-Hercynian and Yanshanian-Himalayan stresses, the Yudu strike-slip fault zone mainly experienced three stages of tectonic strike-slip activities, namely, sinistral movement in Late Caledonian-Early Hercynian, dextral movement in Late Hercynian and sinistral movement in Yanshanian-Himalayan. (3) Strike-slip faults and their associated fractures play an important role in the migration and accumulation of oil and gas. The main period of oil and gas accumulation in the study area is the late Early Cretaceous, which is consistent with the activity of Yudu strike-slip fault zone in Yanshanian.
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图 1 研究区中生界断层分布及地层综合柱状图
Fig. 1. The fault distribution of Mesozoic strata and the comprehensive stratigraphic column in the study area
图 2 玉都走滑断裂带元古界-中生界主要界面相干属性
a.白垩系底界面(T3)；b.侏罗系底界面(T5)；c.长7段底界面(T6c)；d.三叠系底界面(T8)；e.石炭系底界面(T9)；f.寒武系底界面(T11)；g.基底面(Tg)；h.T3-T6c界面断裂形态；i.T8-Tg界面断裂形态
Fig. 2. Correlation attribute of main interfaces between Proterozoic and Mesozoic strata of Yudu strike-slip fault zone
图 3 玉都走滑断裂带中生界不同地层界面相干属性及对应平面解释图
Fig. 3. Coherent properties and corresponding plane interpretation of different strata interfaces of Yudu strike-slip fault zone in the Mesozoic
图 4 玉都走滑断裂带平面断裂样式及连接方式
Fig. 4. Plane fault style and connection mode of Yudu strike-slip fault zone
图 7 玉都走滑断裂带T6c界面活动性质划分
Fig. 7. Division of activity properties at T6c interface of Yudu strike-slip fault zone
图 9 研究区不同层系地层残余厚度
Fig. 9. Stratigraphic thickness maps of different strata in the study area
图 11 研究区不同时期断裂分布及应力特征
C.收缩分量；E.伸展分量；T.张破裂；P.同向剪切破裂；R.同向剪切破裂；R’.反向剪切破裂；PDZ.主滑移带
Fig. 11. Fault distribution and stress characteristics at different periods in the study area
图 12 三叠系延长组长8段流体包裹体镜下照片
a.JH70，1 460.72 m，黄色荧光油包裹体；b.JH70，1 460.72 m，蓝色荧光油包裹体；c.JH72，1 687.89 m，石英加大边中盐水包裹体；d.JH70，1 687.89 m，钙质胶结物中盐水包裹体
Fig. 12. Fluid inclusion mirror images of Chang 8 member of Yanchang Formation, Triassic
图 13 三叠系延长组长8段砂岩包裹体均一温度分布直方图
Fig. 13. Homogenization temperature distribution histograms of sandstone fluid inclusions in Chang 8 member of Yanchang Formation, Triassic
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