A Stratigraphic Case History Using Three‐dimensional Seismic Data in the Gulf of Thailand *

Abstract

A three-dimensional marine seismic survey was conducted in the Gulf of Thailand to aid in the development of a gas field indicated by three wildcat wells.,The results and interpretation reported previously demonstrated improved fault resolution and better structural definition.Five successful appraisal wells have now been drilled, and these show that most of the sands have limited extent. Widespread character changes in the seismic data also support stratigraphic variations in many of the sands.Several new methods of 3D stratigraphic interpretation have been developed while investigating the depositional history of this area. Anomalous seismic amplitudes, tied .to sands penetrated by wells and mapped from SeiscropTM horizontal sections in time and depth, have indicated the distribution of bars and channels. Horizon Seiscrop sections, each sliced through a single bed, have been used to delineate these depositional features directly. G-LOGTM sections, displaying seismic logs derived by rigorous wave equation inversion, confirm the existence of these features. Sands greater than 10 m thick have proved mappable.

Subduction complex uplift and exhumation and its influence on Maastrichtian forearc stratigraphy in the Great Valley Basin, northern San Joaquin Valley, California

“…Once fl attened, seismic amplitudes were extracted from a fi xed time window above or below the fl attened horizon (Brown et al, 1981). Observations from the 3D volume were corroborated and placed within a regional framework through correlation with a larger grid of regional 2D seismic data of varying vintage.…”

Amplitude Spectrum and Edge Detection Attributes for Channels Discrimination and Geometry in Otumara Field, Niger Delta, Nigeria.

“…This link when established between amplitude characteristics and depositional patterns makes it easier to distinguish lithofacies variations in amplitude maps. Brown et al (1981), who was amongst the first to interpret depositional facies from 3D seismic amplitudes also used this technique to recognize buried river channels from amplitude information.…”

Unreciprocated sedimentation along a mud-dominated continental margin, Gulf of Mexico, U.S.A.: Implications for sequence stratigraphy in muddy settings devoid of depositional sequences

“…In addition to scrolling through the data and picking reflections, seismic facies were interpreted on 3-D data via horizon slicing and time slicing (see Brown et al, 1981;Zeng et al, 1995;Zeng and Hentz, 2004). Horizon slicing, a procedure that requires mapping a reflection, shifting it in time, and extracting amplitude onto the surface, was most useful when the interval of interest displayed irregular topography.…”