seismic attributes in petrel « on: April 26, 2010, 10:05:53 pm »
kính thưa các trưởng lão,các vị tiền bối, các cao thủ võ lâm, các đồng môn đồng dạo, sau một thời gian được sư phụ quân đì dẫn dắt, sư phụ đã truyền cho em một wen bí kíp võ công đó là thằng petrel . do tài hèn sức mọn nên không lĩnh hội dc, đành nhờ các vịt tiền bối giảng dạy cho.
em có hai câu hỏi the first: sau khi xây dựng được mô hình địa chất làm thế nào mà m à khi nhìn các cấu trúc và sự phân bố của các đứt gãy mà lựa chọn được cửa sổ tính toán của các thuộc tính( các bậc tiền bối chỉ cụ thể cho em và các thuộc tính như,sweetness,variance, domain freq, chaos,envelop,..khi chạy thuộc tính cho cả cube địa chấn) the second:vd: cửa sổ của thằng domain freq là 33 ms khi chạy cho toàn cube thì được hiểu như thế nào cám ơn các bác đã chỉ bảo. cheer!
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kieu_binh
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Re: seismic attributes in petrel « Reply #1 on: June 16, 2011, 04:48:07 pm »
hehe, sao cậu Đì ko dìu dắt nốt cháu nó thành chính quả luôn đi. Tớ đọc tài liệu thì thấy t hấy có hơn 40 thuộc tính trong Petrel, tớ xin liệt kê 1 số thuộc t huộc tính bằng tiếng Anh để bà con cùng vào bình loạn nha: 1. 3D curvature - for a particular point of a curve, it is defined as the rate of change in the curve direction. it can be used to bring out stratigraphic features in sedimentary environments, karst features or structural discontinuities. 2. Ant tracking - AntTracking is used to automatically extract fau lts from a pre-processed
seismic volume. The pre-processing can be done in Petrel. The result is an attribute volume that displays fault zones in great detail and sharpness. 3... Logged
Trăm nghe ko bằng 1 thấy, Trăm thấy ko bằng 1...sờ.
kieu_binh
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Re: seismic attributes in petrel « Reply #2 on: June 22, 2011, 05:35:00 pm »
3. Apparent polarity
– the polarity of the instantaneous phase, calculated at the local
amplitude extrema. The apparent polarity reveals the sign of the reflection coefficient and indicates features that will change it, such as unconformities. On noisy seismic sections, event continuity can be clearer on the apparent polarity than the original seismic section. 4. Chaos
– measure of the “lack of organization” in the dip and azimuth estimation method.
It can be used to illuminate faults and discontinuities and for seismic classification of chaotic texture. Chaos can be related to local geologic features as it will be affected by gas migration paths, salt body intrusions, reef textures, channel infill, etc.
– the cosine of the instantaneous p hase, also known as „Normalized Amplitude‟. This can help to enhance the definition of structural delineations. Used together 5. Cosine of phase
with Instantaneous phase for comparison. It is commonly used for guiding interpretation in areas poorly resolved on the amplitude or to enhance definition of structural delineation. 6. Dip deviation
– difference between the dip trend and the instantaneous dip. Creates an
edge volume from the input seismic volume. By tracking rapid changes in the orientation field, edges and subtle truncations become visible. This edge attribute has been found to work successfully for low-angle fault illumination. 7. Dix conversion
– solves the Dix equation system to calculate average velocity or interval
velocity as output attribute. An option to domain convert the resulting attribute volume using the internally calculated velocity exists. Alternatively, no conversion of the velocity cube can be selected and by domain converting the result, the input volume will be generated in the opposite domain. 8. Dominant frequency
– calculated as the hypotenuse between instantaneous frequency and
instantaneous bandwidth. Dominant frequency, with instantaneous bandwidth and
instantaneous frequency help in the search for low frequency shadows.
– the total instantaneous energy of the analytic signal (the complex trace), independent of phase. env=sqrt(sqr(Im)+sqr(Real)). Also known as „Instantaneous Amplitude‟, „Magnitude‟ or „Reflection Strength‟. The envelope attribute is important as it 9. Envelope
detects bright spots caused by gas accumulations, major lithological changes that are caused by strong energy reflections and sequence boundaries. The attribute clearly shows subtle lithological changes that may not be apparent on the seismic data. Envelope can be used to help recognize phase differences between seismic versions. The peak energy should align independently of the data phase. 10. First derivative
– the first time derivative of th e input seismic volume/trace. It is useful
for stratigraphic analysis, facies estimation, and horizontal well placement since the phase of a zero-phase seismic cube will be rotated into something more closely mimicking a well log. 11... « Last Edit: June 22, 2011, 05:37:31 pm by kieu_binh » Logged
