Oligocene–Miocene carbonates are prolific hydrocarbon reservoirs in Southeast Asia. Extensive subsurface data for this stratigraphic section has become available through exploration and production activities. A carbonate shelf in the study area showed an evolution in shelf architecture and lithofacies during this period. Despite the economic importance, complexity, and data availability, there have been few published studies on a comprehensive description and interpretation of carbonate-shelf evolution in the region.We utilized data from nineteen wells and 1,300 km2 of 3D seismic data from offshore East Java to study the Oligocene–Miocene Kujung Formation. An average of 700 m stratigraphic sections from this formation were analyzed. This interval spans 13.5 million years (My) from the Rupelian, Chattian, through Aquitanian constrained by numerical ages from 87Sr/86Sr. The Kujung Formation is subdivided into the Rupelian–Chattian mixed-siliciclastic–carbonate shelf (MSCS) and the Aquitanian carbonate-buildups shelf (CBS) based on shelf architecture and lithofacies. The boundary between the MSCS and CBS is interpreted to be near the Oligocene–Miocene boundary at 23 Ma. Accumulation rates in the CBS are up to three times greater than that of the MSCS. We propose new depositional models for the Kujung Formation, which was used to discuss the dominant controls on shelf evolution.This study suggests that although climate played a role in dictating environmental conditions during the Oligocene–Miocene, the dominant factors controlling carbonate-shelf evolution in the study area appear to have been antecedent topography, routing of siliciclastic sediment, and patterns of sea-level fluctuation.

中文翻译：

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始新世至中新世的碳酸盐岩架演化：印度尼西亚东爪哇省近海古架组的层架构造，岩相和沉积模型的见解

渐新世—中新世碳酸盐是东南亚多产的油气藏。该地层剖面的广泛地下数据已经通过勘探和生产活动获得。在此期间，研究区的碳酸盐岩架显示出其架构和岩相的演化。尽管具有重要的经济意义，复杂性和数据可用性，但有关该地区碳酸盐岩层架演化的全面描述和解释的研究很少，我们利用了19口井的数据和1,300 km2的东爪哇海岸至研究渐新世-中新世古戎组。分析了该地层的平均700 m地层剖面。这个间隔距离Rupelian，Chattian，受数字年龄限制，从87Sr / 86Sr到Aquitanian。根据陆架结构和岩相，将古戎组划分为Rupelian-Chattian混合硅质-碳酸盐岩架（MSCS）和Aquitanian碳酸盐岩堆积架（CBS）。MSCS和CBS之间的边界被解释为在23 Ma的渐新世-中新世边界附近。CBS中的累积率最多是MSCS的三倍。我们提出了古晋组的新沉积模型，用于讨论陆架演化的主要控制因素。这项研究表明，尽管在渐新世—中新世期间气候在决定环境条件方面发挥了作用，但控制碳酸盐岩层架演化的主要因素却是其中。研究区域似乎是先前的地形，硅质碎屑沉积物路线，