![]() ![]() The main components of the thermal regime of a region consist of the present subsurface temperature distribution and the surface HFD. In addition, the interpretation concerning the observed HFD distribution is also limited to spatial correlation on a qualitative basis, i.e., by establishing a relationship between the HFD pattern and geological information and gravity anomaly. Nevertheless, the primary goals of Suryantini ( 2007) were the determination of heat flow values and their use in a thermal history modeling exercise of a single well located at the onshore Northwest Java Basin, rather than the characterization of the entire basin’s present-day thermal state. Although the study was carried out for the entire West Java, a more substantial part of it was dedicated to analyzing the HFD distribution in the onshore Northwest Java Basin area (Fig. The most recent compilation was produced in a study by Suryantini ( 2007). However, there had been an over two decade-long time gap since an updated compilation of HFD data was made for sedimentary basins in Indonesia. ( 1980) and Thamrin ( 1985), pioneered the first determinations of HFD values using temperature data from hydrocarbon wells and thermal conductivity measurements on their respective core samples. A number of authors, e.g., Carvalho et al. The history of terrestrial heat flow density (HFD) studies conducted in Indonesian sedimentary basin regions dates as far back as the early–mid-1980s. The modeling results are thus capable of demonstrating the importance of a quantitative approach in studying the present thermal state of a sedimentary basin. Comparison between the computed and the observed heat flow densities, taking into account the uncertainties of both, suggests that advective heat transport by groundwater flow may be present, in addition to conduction. The modeled temperature field reveals its dependence on the geometrical aspects of the basin’s basement. The temperature distribution is translated into the predicted surface heat flow distribution. Taking into account a conductive heat transfer process, the modeling exercise is aimed at deriving a 3-D subsurface temperature distribution. For these reasons, in this study we have attempted to quantitatively characterize the present subsurface temperature distribution and surface heat flow density of the onshore Northwest Java Basin using a simple numerical thermal modeling approach, based on the most recent heat flow datasets. One basin experiencing this particular problem is the onshore Northwest Java Basin, where knowledge of the present-day subsurface temperature structure is virtually absent and interpretation of heat flow distribution has been mainly qualitative. In addition, syntheses on the possible causes to the observed heat flow density distribution in these basins have been largely determined only on the basis of its correlation with geological and geophysical evidences. ![]() Even so, all of these studies have always concentrated on the basic compilations of thermal gradient, thermal conductivity, and terrestrial heat flow datasets or the study of basin thermal history rather than on the investigations into their present thermal regime. Studies pertaining to heat flow density distribution in Indonesian tertiary sedimentary basins have been conducted intermittently throughout more than two decades. ![]()
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