SE El Can
8900 9700
Datum
11300 9800
9000
K4
9100 9900
11400
K3
9200 11500 0
0.05? 0.1?
km
4 0 ft
0.5? 1? 5?
100
11700
Comparison of Seismic Response w ith Predictions
二 基准面旋回对比
Concept of correlation of base-level cycles
• Strata are naturally divisible into stratigraphic cycles that Record cycles of base-level • The turnaround points in base-level cycles, from rise to fall and from fall to rise, are the preferred positions for highresolution stratigraphic correlation • Turnaround points are represented by surfaces of stratigraphic discontinuity,such as unconfomities and hiatal surfaces, or by continuous rock succession • Stratigraphic sequences are not necessarily bound by unconformities • High–resolution correlation requires knowing when to correlate rocks to rocks,rocks to surface,and sirface to surface
NW 2.5 Shingled progradation in KT1 SE
Discontinuous reflections in Tp
Top Tm Top Tp Top KT2 Top CS or K6 Top of Paleozoic
3.0
Onlap of KT0 0 3.5 km 1
Oblique progradation in K1-K4
碎屑岩：GR、SP、R 煤、泥炭：GR、SP、R、密度、中子 碳酸盐、蒸发岩：GR、SP、R、 声波、氢-中子
盆地方向
4 3 2 1
中期基准面上升
4 3 2 1
Ａ > Ｓ¡ 1
退积
4 3 2 1
sp
Rt
4 4 3 2 1 3 2 1
Ａ = Ｓ 1
加积
4 3
sp
Rt
2 1
中期基准面旋回
4 3 2 1 4 3 2 1
K3
B a s e -l e v e l fa l l s tra ta
K2
B a s e -l e v e l ri s e s tra ta
Pz Marker
K1
Stratigraphic Cross Section Parallel to Depositional Dip
NW Centauro-1 Entrerios-1 Casimena-1
Tentasive scheme for dynamic correlation of stratigraphic units across evironments through time,using patterns of thinning/thickening and symmetry reversals recorded by progradational events.
第三章 基准面旋回识别与对比
(recognition and correlation of base level cycles)
一 基准面旋回识别方法
(Methods for recognizing base level cycles)
露头与岩心
测井基准面旋回识别与对比
测井曲线组合序列的选择：
K T3
K T2
Key
K T1
K6
u n c o n fo rm i ty b a s e -l e v e l ri s e s u rfa c e
K5
1500 2000 feet
K4
c o n d e n s e d s e c ti o n b a s e -l e v e l ri s e s u rfa c e
（1）以岩心、测井曲线分析为基础，识别短期基准面旋回 或成因地层单元。观察相序和相组合反映的彼此相邻 的沉积环境在地理位置的迁移方向。 （2）以测井资料分析为基础，识别短期旋回的叠加样式， 组合较长期基准面旋回。短期旋回叠加样式反映了 长期地层旋回形成过程中 A/S比值的变化。叠加样式 三种，即退积，加积、进积、它们是较长期基准面旋回 上升和下降过程中向可容纳空间最大值或最小值单向移动 的结果，是识别较高级次基准面旋回的基础。 （3）以地震资料为基础，运用地层的几何形态及地震反射终端 性质识别较高级次层序界面，从而识别长期基准面旋回。 如上超现象反映可容纳空间的增加或 A/S比值增大，代表基 准面上升期；顶超现象反映可容纳空间减少或 A/S比值的减小， 代表基准面下降期；整一现象则反映地层处于加积状态，可 容纳空间或A/S比值变化并不明显，基准面处于下降到上升的 转换位置。
Ａ Ｓ
<1
进积
4 3
sp
Rt
2 1
深 海岸平原砂岩和泥岩 浅海砂岩 可容纳空间 沉积物供给 海槽泥岩 加
基准面上升 转换点
1 ¶短期地层旋回
变 浅 基准面下降
短期旋回的叠加样式与测井响应
ZERO PHASE WAVELETA
Thickness(meters)
_ 20 +
0 Hiatus (Sediment Bypass) 100
75
TIME(kyr)
50 25
Condensed Section
0 Coastal Plain Offshore Marine
Shoreface
Tc8
Correlation Framework of the Nonmarine Llanos Basin, Colombia
Tm3
Tm2
Tm1
K T4