## 1 Introduction  
The glacio-eustic sea level changes of the Quaternary have overprinted the dissolution record of many carbonate islands with multiple episodes of vadose, freshwater phreatic, mixing zone and marine phreatic conditions [1]. This phenomenon has led to karst development on the continuously emergent portions of carbonate platforms. Karstification by definition is a process where carbonate rocks or other soluble components dissolve as a result of the infiltration of acidic water such as water-soluble carbon dioxide from the atmosphere and soil. The acidic water infiltrates through weak zones such as faults and fractures of carbonate platforms and creates distinct karst landforms such as sinkholes, dolines, caverns, and limestone pavements [2]. [PERSON] and [PERSON] [3] defined karst as comprising terrain with distinctive hydrology and landforms that arise from the combination of high rock solubility and well-developed secondary porosity (fracture). The development of karst takes place at irregular rates that typically include episodes of stagnation and even retrograde processes in which the evolution toward maturity is reversed [4]. Karsti in carbonate platforms of Central Luconia has been discussed by many scholars since the 1980s [5; 6; 7; 8; 9; 10; 11; 12; 13; 14]. Karstification in Central Luconia was first detected in the early days of exploration when most of the drilled wells encountered mud losses and other complications [7]. It was first postulated by [PERSON] [5] from textures and geochemistry investigations of which suggested to be fresh water leaching during the periods of emergence. However, further strontium analysis by [PERSON] [6] suggests that meteoric diagenesis had played a major role in the development of a well-connected karst system in the Central Luconia platform. [PERSON] et al. [15] in their study on E11 field, Central Luconia, and the Malampaya field, offshore Philippines, revealed that meteoric leaching and cementation as well as late leaching created depositional-layer-conformable geobodies of high-porosity and low-porosity rocks. Further seismic interpretation supplemented with attribute analysis revealed prominent dendritic features on Central Luconia carbonate platforms and were studied by only a few authors, however, the karst features have never been quantitatively described in detail [5; 6; 7; 8; 9; 10; 11; 12]. Understanding of the geometry and connectivity of karst is essential in field development, well management, and hydrocarbon recovery. Karst has a huge impact on the future development of hydrocarbon reservoirs such as well planning where karst causes problems with losses and completion length. Field production is also largely affected by karst as wells are likely to water-out quicker. In-place volume estimates might be inaccurate due to the nature of karst which may create substantial secondary porosity. Hence, there is a strong business case to map out karst in detail as an input for the field development plans for example [9]. The Carbonate Island Karst Model (CIKM) integrates the components that control the cave and karst development on carbonate islands, of which [16] states includes:  
1. Dissolution aggressivity due to the mixing of fresh and salt water. 2. Mixing environments from freshwater lens movement resulted from quaternary glacioestasy. 3. Presence of overprinting of glacioestatic changes by local tectonic movements. 4. Epigenetic (diagenetically immature) carbonate rocks. 5. The classification of carbonate islands from simple to complex categories. [PERSON] and [PERSON] [17] in their study on the relationship of island karst with respect to their area and perimeter revealed that subaerial island sizes influence the development of conduit caves in simple carbonate islands. Larger platforms are expected to have conduit and flank margin caves forming at the same time.