Structural geology of the Northern part of Suphan Buri basin, Ban Phai Khwang area Changwat Suphan Buri

Abstract

The study area covers the northern part of Suphan Buri basin with the surface area of approximately 55 km2. Suphan Buri basin is half graben with North-South trending normal faults. The basin appears to be pull-apart basin as it lies between two major Tertiary strike-slip faults zones, the Mae Ping fault and Three Pagoda fault zones. . The previous 2D seismic interpretation in 2004 shows the faults in this area might form structural closures. This study aims to interpret and create structural maps for Ban Phaikwang area by using 3D seismic cube which had been acquired in 2005, well checkshot, and well top markers of X, Y and Z horizons. Coherency attributes, combining with seismic interpretation, were utilized to validate the faults existence. The detailed interpretation from this study found half graben in northern part and full-graben from central to southern part. From structural maps and fault throw analysis show that there are 4 joined faults mostly in southern and central part of area in horizon X and Y and some joined faults can be structural closures. Moreover from reconstruction model demonstrate sedimentary deposition of horizon X, Y and Z did not deposit at the same time and there are fault reactivations in this study area because of sedimentary loaded. The result shows that the selected technique able to reduce the uncertainty of fault segment continuity and the closure identification.