Velocity Model Analysis Based on Integrated Well and Seismic Data of East Java Basin

41st HAGI Annual Convention and Exhibition 2016

Mubin, Fathul^1 ; Widya, Aviandy^1 ; Nurcahya, Budi Eka^1 ; Mahmudah, Erma Nurul^1 ; Purwaman, Indro^2 ; Radityo, Aryo^2 ; Shirly, Agung^2 ; Nurwani, Citra^2

Geophysics Department, Universitas Gadjah Mada, Yogyakarta, Indonesia^1

SKK Migas, Jakarta, Indonesia^2

关键词: Average velocity;    Geological factors;    Geological modeling;    Geological models;    Geological parameters;    Oil and gas exploration;    Prospect generation;    Rock formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/132/1/012008/pdf
DOI  :  10.1088/1755-1315/132/1/012008

来源: IOP

【 摘 要 】

Time to depth conversion is an important processof seismic interpretationtoidentify hydrocarbonprospectivity. Main objectives of this research are to minimize the risk of error in geometry and time to depth conversion. Since it's using a large amount of data and had been doing in the large scale of research areas, this research can be classified as a regional scale research. The research was focused on three horizons time interpretation: Top Kujung I, Top Ngimbang and Basement which located in the offshore and onshore areas of east Java basin. These three horizons was selected because they were assumed to be equivalent to the rock formation, which is it has always been the main objective of oil and gas exploration in the East Java Basin. As additional value, there was no previous works on velocity modeling for regional scale using geological parameters in East Java basin. Lithology and interval thickness were identified as geological factors that effected the velocity distribution in East Java Basin. Therefore, a three layer geological model was generated, which was defined by the type of lithology; carbonate (layer 1: Top Kujung I), shale (layer 2: Top Ngimbang) and Basement. A statistical method using three horizons is able to predict the velocity distribution on sparse well data in a regional scale. The average velocity range for Top Kujung I is 400 m/s-6000 m/s, Top Ngimbang is 500 m/s-8200 m/s and Basement is 600 m/s-8000 m/s. Some velocity anomalies found in Madura sub-basin area, caused by geological factor which identified as thick shale deposit and high density values on shale. Result of velocity and depth modeling analysis can be used to define the volume range deterministically and to make geological models to prospect generation in details by geological concept.