Seismic source specially designed for the Meso-Paleozoic strata and its applicaton to South Yellow Sea
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摘要:
南黄海崂山隆起存在新近系底界T2强反射界面, 中深部发育多套碳酸盐岩高速层, 并经历长期的压实作用及复杂的构造运动, 波阻抗差异变小, 构造特征更为复杂, 使得地震波场复杂, 深层有效的地震反射信号较弱, 信噪比较低, 成像质量较差。为了改善中-古生界反射波成像质量, 着重对震源端进行攻关, 优化设计了2组富低频、强能量的气枪组合震源(总容量为6390in3), 分别是沉放10m的平面组合震源和“倒梯形”立体组合震源(4子阵沉放深度分别为7、10、10、7m)。通过外业试验, 优选了低频更强的平面组合震源作为地震采集震源方案。与以往地震资料进行了对比, 本次采集的地震资料能量衰减较慢, 深层能量更强, 整体改善了T2不整合面下伏反射层的成像质量, 为该区的中-古生界油气勘探奠定基础。
Abstract:Successful seismic survey in the South Yellow Sea has been a great challenge to both researchers and oil industry for years. The seismic reflection signal from deep is always very weak and the seismic wave field very complex. Therefore, the seismic imaging quality of the deep strata has been considerably poor in the past decades. The main reasons come from: 1. there are a strong reflector (T2 seismic reflection interface) and multi-sets of carbonate strata with high seismic velocity widely distributed in the region. 2. the impedance contrast of strata is small in the region as both the Mesozoic and Paleozoic strata have suffered long-term compaction. 3. the structure of the region is too complicated as the result of strong tectonic movement. In this paper, we proposed a specific and targeted seismic survey design, especially a special air-gun source, for the purpose to improve the images from the deep part. A systematic review is made on airgun theories. The wavelet features of sigle airguns, strongly-interacting clustered airguns, weakly- interacting tuning airguns and sub-array airguns are reviewed one by one. Above it, key factors for multi-level source are analyzed, such as the sub-array depth combination and firing time-delay. Then a design approach on plane-distributed airgun source and cubic-distributed airgun source(multi-level source) are developed. A 6390in3 airgun source composed of 4 sub-arrays is specially designed for the South Yellow Sea 2016 Project. Two sets of seismic source is optimized, one is 10m in depth for all 4 sub-arrays and the other is 7m-10m-10m-7m in depth in shape of an inverted trapezoid. Field testing demonstrates that the plane-distributed airgu system with stronger low frequency components absorbs less energy and thus is more effective. It is a breakthrough indeed. Some deep strata become visible, and the seismic signal of the deep strata strengthened. The general quality of seismic images below the strong reflector (T2 seismic reflection interface) is greatly improved. The breakthrough and improvement have laid a solid foundations for future exploration of petroleum in deep strata of the region.
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表 1 南黄海盆地地震反射界面以及地质属性(据陈建文等，2016年)
Table 1. The seismic reflection interfaces and their geological properties
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表 2 气枪组合震源(6390in3)不同沉放深度模拟远场子波参数统计
Table 2. The far-field seismic wavelet parameters on 6390in3 source in different depths
沉放深度/m 主峰值/(bar·m) 峰-峰值/(bar·m) 初泡比 低截频/(-6dB，Hz) 高截频/(-6dB，Hz) 优势频宽/(-6dB，Hz) 主频/(-6dB，Hz) 6 113.0 234.7 26.1 6 99 93 52.5 8 107.7 222.2 19.8 6 89 83 47.5 10 110.6 228.0 19.9 6 66 60 36 12 106.9 220.3 13.8 6 50 44 28
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表 3 气枪立体组合震源(6390in3)不同沉放深度模拟远场子波参数统计
Table 3. The far-field seismic wavelet parameters on 6390in3 source in different depths
沉放深度/m 主峰值/
(bar·m)峰-峰值/
(bar·m)初泡比 低截频/
(-6dB，Hz)高截频/
(-6dB，Hz)优势频宽/
(-6dB，Hz)主频/
(-6dB，Hz)5.5/10 109.1 183.5 20.1 6 70 64 38.0 7/10 112.6 182.5 20.6 6 70 64 38.0 8.5/10 108.4 206.7 20.8 6 69 63 37.5
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表 4 气枪立体组合震源(6390in3)不同组合形状模拟远场子波参数统计
Table 4. The seismic wavelet parameters of 6390in3 multi-level source in different shapes
序号 震源沉放
深度/m主峰值/
(bar·m)峰-峰值/
(bar·m)初泡比 低截频/
(-6dB，Hz)高截频/
(-6dB，Hz)优势频宽/
(-6dB，Hz)主频/
(-6dB，Hz)1 倒梯形7-10-10-7 112.6 182.5 20.6 6 70 64 38.0 2 正梯形10-7-7-10 112.1 178.0 18.0 6 70 64 38.0 3 N形10-7-10-7 112.4 178.6 15.3 6 70 64 38.0
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表 5 地震数据采集参数试验方案
Table 5. 4 test plans for acquisition of parameters
试验方案 震源类型 震源沉放深度/m 电缆沉放深度/m 1 平面组合震源 10 16 2 平面组合震源 10 20 3 “倒梯形”立体组合震源 7-10-10-7 20 4 “倒梯形”立体组合震源 7-10-10-7 16
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