Characterization of Architecture of Intraplate Strike-Slip Faults in Yanchang Formation of Jinghe Oilfield in Southern Ordos Basin
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摘要: 板内走滑断裂的内部结构具有控储和控藏作用.在断缝体油气藏勘探开发过程中，由于走滑断裂带内部结构具有高度非均质性，需要对其内部结构进行刻画.综合岩心、测井和地震资料，对鄂尔多斯盆地南部泾河油田延长组走滑断裂带进行了走向分段和侧向分带研究，并提出了利用综合裂缝指数测井(comprehensive fracture index log，CFI)和断层形态指数地震属性(fault shape index attribute，FSI)累积曲线定量划分损伤带边界的方法.结果表明，泾河油田延长组走滑断裂带以张扭段和走滑段为主，压扭段仅少量发育.CFI和FSI均与裂缝密度呈正相关关系，根据累积CFI和累积FSI曲线的梯度变化可以刻画地下走滑断裂的损伤带边界.泾河油田延长组走滑断裂带内单条断裂的宽度主要在160~300 m，且张扭段的宽度最大，其次为压扭段和走滑段.
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关键词:
- 板内走滑断裂带 /
- 内部结构 /
- 损伤带 /
- 断裂带宽度 /
- 走向分段 /
- 综合裂缝指数测井(CFI) /
- 断层形态指数属性(FSI) /
- 延长组 /
- 鄂尔多斯盆地南部 /
- 构造
Abstract: The architecture of intraplate strike-slip faults plays an important role in controlling reservoir properties as well as hydrocarbon migration and accumulation. In the process of exploration and development of strike-slip fault-controlled fracturing reservoirs, the architecture of the strike-slip fault zone needs to be characterized because of its high heterogeneity. Taking strike-slip fault zones of the Yanchang Formation of the Jinghe oilfield in the southern Ordos basin as an example, in this paper it conducted fault segmentation along the fault strike and lateral zonation along the fault dip by integrating core, logging and seismic data. In this paper it puts forward a method to quantitatively detect damage zone boundaries by cumulative curves of comprehensive fracture index log (CFI) and fault shape index attribute (FSI). The results show that strike-slip fault zones of the Yanchang Formation in the Jinghe oilfield are mainly composed of transtensional and strike-slip segments, and transpressional segments are rarely developed. CFI and FSI are positively correlated with fracture density, and damage zone boundaries can be detected according to the gradient change of the cumulative curves of CFI and FSI. The width of a single fault within the strike-slip fault zones in the Yanchang Formation of the Jinghe oilfield is mainly between 160-300 m, and the average width of transtensional segments is the largest, followed by transpressional and strike-slip segments. -
图 1 鄂尔多斯盆地南部泾河油田的构造位置及走滑断裂体系
a.构造位置；b.走滑断裂体系；c.延长组地层及地震层位
Fig. 1. Structural position and strike-slip fault system of the Jinghe oilfield in the southern Ordos basin
图 3 延长组长7段底面(T6c界面)永正走滑断裂带的分段特征
a.延长组长7段底面(T6c界面)的FSI地震属性图及解释断层；b.T6c界面沿永正走滑断裂带走向的落差变化图
Fig. 3. Segmentation of Zaosheng strike-slip fault zone at the bottom surface of the Chang 7 member (T6c)
图 4 延长组长7段底面(T6c界面)早胜走滑断裂带的分段特征
a.延长组长7段底面(T6c界面)的断层形态指数地震属性图及解释断层；b.T6c界面沿早胜走滑断裂带走向的落差变化图
Fig. 4. Segmentation of Zaosheng strike-slip fault zone at the bottom surface of the Chang 7 member (T6c)
图 5 延长组长7段底面(T6c界面)榆林子走滑断裂带的分段特征
a.延长组长7段底面(T6c界面)的FSI地震属性图及解释断层；b.T6c界面沿榆林子走滑断裂带走向的落差变化图
Fig. 5. Segmentation of Yulinzi strike slip fault zone at the bottom surface of the Chang 7 member (T6c)
图 6 走滑断裂带的分段类型及特征
Fig. 6. Segmentation types and characteristics of strike-slip fault zones
图 7 取心井JH23井和JH63井的综合柱状图
a.JH23井；b.JH63井
Fig. 7. Comprehensive log diagrams of cored wells JH23 and JH63
图 8 JH17P23成像测井水平段的走滑断裂带内部结构
a.JH17P23水平段的电成像及内部结构解释；b.JH17P23水平段的综合测井柱状图
Fig. 8. Interpreted architecture of strike-slip fault zone in the horizontal section of JH17P23 image logs
图 10 JH17P23井水平段的综合裂缝指数(CFI)与裂缝密度(FD)的关系
Fig. 10. Relationship between the comprehensive fracture index (CFI) and fracture density (FD) in the horizontal section of well JH17P23
图 11 水平井JH61P1水平段的损伤带边界划分
a.长7段底界面(T6c)FSI属性切片的JH17P61位置及断裂解释；b.过JH17P61的地震剖面及断裂解释；c.JH61P1测井柱状图
Fig. 11. Damage zone boundary identification of the horizontal section of horizontal well JH61P1
图 12 JH17P23井水平段断层形态指数属性值(FSI)与粗化后的裂缝密度(FD)的关系
Fig. 12. Relationship between the absolute value of fault shape index (FSI) and scaled-up fracture density (FD) the in the horizontal section of well JH17P23
图 15 泾河油田长7段底界面(T6c)断层形态指数属性切片上主要走滑断裂带的损伤带边界
FSI < 0，指示断层下降盘；FSI > 0，指示断层上升盘
Fig. 15. Damage zone boundaries of three main strike-slip faults on bottom interface (T6c) of Chang 7 member in the Jinghe oilfield
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