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首页> 外文会议>Annual Indonesian Petroleum Association convention and exhibition >MIDDLE MIOCENE MELIAT FORMATION IN THE TARAKAN ISLAND, REGIONAL IMPLICATIONS FOR DEEP EXPLORATION OPPORTUNITY
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MIDDLE MIOCENE MELIAT FORMATION IN THE TARAKAN ISLAND, REGIONAL IMPLICATIONS FOR DEEP EXPLORATION OPPORTUNITY

机译：塔拉坎岛中的中间内肾熔化形成，区域影响深度勘探机会

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Most hydrocarbon exploration activities in the Tarakan Basin have been focused on the shallow targets of Upper Miocene-Pliocene deltaic sediments of Tarakan and Santul Formations. In the Bangkudulis and Sembakung Fields, however, hydrocarbon was found from Middle Miocene Meliat Formation. Therefore to study Meliat Formation reservoirs in the basin, deeper exploration targets have become more important. Meliat Formation in the Tarakan Island appears to be previously unidentified. This unit has been encountered as an incomplete section in Barat-1 well only. An integrated study of the well logs, biostratigraphy, with 2D and 3D seismic data have been carried out to understand the stratigraphic correlation, distribution and geometry of the formation both on and off the Island. In the Barat-1 the formation is more than 630 m thick siliciclastics, with thin limestone at its top. The lower (250 m thick sandstone-rich) unit is interpreted to have been deposited in an estuarine underlying fluvial channel fills in the unintersected section. The upper (380 m thick) unit represents deltaic cycles of shelf shale with carbonate, and lower delta front sand. Sequence Stratigraphic interpretation of the formation suggests that the unit is divisible into two sequences, sequences Ml and M2. The interpreted fluvial channel fills of the lowest part of Sequence Ml developed above a regional unconformity (SB 16.5 Ma) as late lowstand systems tract (LST) deposits. These deposits are likely to be associated stratigraphically with equivalent sand-bearing slope fan facies overlying early lowstand basin floor fan turbidites eastward from the island. The overlying aggradational tidal influenced estuarine (distal deltaic distributary channels) LST sand of the Lower Unit could be shale out distally eastward. The highstand systems tract of Sequence Ml and the overlying sequence 2 reveal slightly progradational deltaic cycles developed in association with sea-level fluctuations and higher accommodation space, with periods of lacking coarse siliciclastic influx lead to carbonate sedimentation on top of the formation. Locally identified sand-bearing nearshore facies of the sequence M2 located both in the northern part and south of the island are interpreted to have been related to relative sea level drop due to force regression event. The reservoir-bearing faeies of the basin floor with the overlying slope fans, channel-fill facies, and forced regressive sands are thought to have been regionally developed in the Tarakan basin. In addition, thin carbonate bed on top of Meliat Formation in the Tarakan Island is lateral to the west and southwest changing facies into thick and better developed carbonate-build-ups.
机译：在打拉根盆地大部分油气勘探活动，都集中在塔拉坎和Santul地层的上部中新世上新世三角洲沉积的浅目标。在Bangkudulis和Sembakung字段，但是，烃从中新世Meliat形成找到。因此，研究Meliat组储层在盆地，更深层次的探索目标已变得更加重要。在打拉根岛Meliat形成似乎是以前未知的。这个单元已经遇到作为一个不完整的部分中巴拉1井只。测井记录，生物地层的一个集成的研究中，二维和三维地震数据已进行了解双方和关闭岛地层的地层对比，分布和几何形状。在巴拉-1的形成630个多米厚的硅质碎屑，在其顶部薄石灰石。下部（250微米厚的富砂岩）单元被解释为已经在河口在unintersected节河流通道填充底层沉积。上部（380微米厚）单元代表与碳酸货架页岩三角洲周期，和下三角洲前缘砂。形成的序列地层解释表明，单位是分割成两个序列，序列M1和M2。序列M1的最低部分的解释河流通道填充一区域不整合（SB 16.5马）迟低位体系域（LST）沉积物上述显影。这些沉积物可能与沙相当于轴承斜坡扇相叠加初从岛上向东低位盆底扇浊积岩地层有关。上覆加积的潮汐影响河口（远端三角洲分流河道）下部单元的LST砂可远端向东页岩出来。序列ML的高位体系域和所述覆盖序列2揭示了在与海平面波动和更高容纳空间协会开发略微进积三角洲周期，与缺乏粗碎屑涌入导致碳酸盐沉淀上形成的顶部的期间。当地确定的位于序列M2两者的沙子含近岸相在北部和南部岛屿的解释已经涉及到相对海平面下降，由于力回归事件。与上覆斜率风扇，信道填充相盆底的贮存承载岩相，和强迫回归砂被认为已经在塔拉坎盆地已开发区域。此外，在打拉根岛Meliat形成的顶部薄碳酸盐床侧的西部和西南部改变相切成厚和更发达的碳酸盐集结。

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