Sukajaya Lempasing is one of the villages located in Teluk Pandan District, Pesawaran Regency, Lampung Province. Sukajaya Lempasing Village was chosen as a place for research because of its position on the east coast which is directly adjacent to Lampung Bay, of which its groundwater is suspected to be contaminated by seawater, causing the water to be brackish. Field observation, data collection, as well as lithology and air control are needed to see the geological and hydrogeological conditions of this area. Based on the physical and chemical parameters, the well of Hamlet 7 has groundwater and there is no indication of sea water intrusion because the area is very close to hills which may become a catchment area so that groundwater flows out to sea with high pressure. Based on the salinity, TDS, and conductivity values ​​obtained, the well that experienced seawater intrusion was the AJR3 well because it is located closest to the coastline and is supported by an alluvial sediment aquifer that has moderate to high aquifer productivity. The quality of water based on physical parameter data from wells in Hamlet 1, Hamlet 7 and sample AJR4 Hamlet 3 is classified as clean and suitable for daily use. The lithology in the form of alluvial deposits allows seawater intrusion, especially in areas close to the shoreline such as the AJR3 well.

Biak Island is thought to have originated from the Australian Continental passive margin in the Mesozoic. This passive margin underwent tectonic collision to form the bedrock of Biak Island during the Paleogene. East Biak is covered by limestone, which is an obstacle to knowing the deeper stratigraphy. This study's aim was to identify the subsurface geology of the East Biak area based on rock resistivity values. Magnetotelluric (MT) surveying is a passive geophysical method that is able to interpret subsurface geology based on rock resistivity values at depths of up to 5 to 10 km. The MT measurements in East Biak used 25 measurement points. Cross-sectional variations in rock resistivity values generated from the MT measurements were used to identify rock types in the East Biak subsurface. Five rock units were identified. The East Biak stratigraphy model is dominated by carbonates, comprising two sequences, i.e. an Early Neogene sequence with a thickness of 1,000 to 3,000 m and a Late Neogene to Quaternary sequence with a thickness of 180 to 2,450 m. The unconformity between these two sequences is due to tectonic activity, which separated Supiori and Biak Island.

Cekungan Tomori merupakan salah satu cekungan frontier yang terdapat di daerah Teluk Tomori, Sulawesi, termasuk didalamnya Formasi Tetambahu yang merupakan salah satu batuan reservoir berpotensi hidrokarbon. Kemunculan formasi ini yang didominasi oleh sedimen karbonat terjadi akibat adanya aktivitas tektonisme pada Miosen, bersamaan dengan kemunculan mikrokontinen Banggai-Sula. Berdasarkan analisis mikrofasies dan diagenesis dari tujuh sampel batugamping wackestone Formasi Tetambahu pada lintasan Korololama, menunjukkan karakteristik biosclastic wackestone dan coated grain in micrite, dan diendapkan pada lingkungan shelf lagoon open circulation. Proses diagenesis yang dialami formasi ini adalah eodiagenesis, mesodiagenesis, dan telodiagenesis, sehingga porositas yang terbentuk terdiri atas vuggy porosity, interparticle, dan intragranular microporosity.