Local Dip Filtering: a Robust Approach of Multiples Attenuation in South Oman Data

M.S. Al-Jahdhami¹ and H. Rynja²

Abstract

In South Oman remnant multiples hinder a reliable interpretation of the target reflectors. Conventional multiples removal techniques such as Radon, FK, SRME and inter-bed de-multiple have not been successful in delivering sufficiently multiple-free data allowing proper interpretation. We present a new technique that helps to attenuate multiples that exhibit a different dip from primaries. The main prerequisite for this technique to work effectively is to have a well-understood and sufficiently large dip discrimination between primaries and multiples. In South Oman data, this scenario is very common as flat strong carbonate overburden reflectors generate a train of high amplitude reverberations masking weak undulating primaries underneath. Dip-filtering is applied within the time gate where this prerequisite is valid.

AAPG Search and Discovery Article #90188 ©GEO-2014, 11th Middle East Geosciences Conference and Exhibition, 10-12 March 2014, Manama, Bahrain