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首页> 外文会议>Annual Indonesian Petroleum Association convention and exhibition;Indonesian Petroleum Association convention and exhibition;IPA >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：塔拉干岛中的中新世ME系形成，对深部勘探机会具有区域意义

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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 fanturbidites 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：塔拉干盆地的大多数油气勘探活动都集中在塔拉干和桑图尔组的上中新世-上新世三角洲沉积物的浅层目标上。然而，在Bangkudulis和Sembakung油田中，发现了中新世中部Mel石层中的碳氢化合物。因此，研究盆地中的Meliat组储层，更深的勘探目标变得越来越重要。 塔拉坎岛的形成似乎以前是未知的。仅在Barat-1井中将该单元作为不完整部分遇到。进行了对测井曲线，生物地层学以及2D和3D地震数据的综合研究，以了解该岛上和岛外的地层相关性，分布和几何形状。在Barat-1中，地层为630 m以上的硅质碎屑岩，顶部为薄石灰岩。下部（富含砂岩的250 m厚）单元被解释为沉积在未相交部分的河口河床下河道充填物中。上部（380 m厚）单元代表含碳酸盐的层架页岩和下部三角洲前砂的三角洲循环。 序列对地层的地层学解释表明该单元可分为两个序列，即序列M1和M2。序列M1最低部分的解释河道充填在区域不整合面（SB 16.5 Ma）之上形成，为后期低水位系统道（LST）沉积物。这些沉积物可能在地层上与早期低水位盆地底板扇上覆盖的等效含砂斜坡扇相有关。 浊浊的东西从岛上向东。下部单元上覆受潮汐影响的河口（远端三角洲分布河道）LST砂岩可能向东向页岩外扩散。层序M1和上覆层序2的高位系统域显示出与海平面波动和较高的容纳空间有关的发育的轻微三角洲周期，缺乏粗粒硅屑涌入的时期导致碳酸盐岩沉积在地层顶部。位于该岛北部和南部的序列M2的局部识别含砂近岸相被解释为与力回归事件引起的相对海平面下降有关。 塔拉坎盆地地区性地开发了盆地地层的含储层的辉光岩以及上覆的倾斜扇，河道填充相和强迫退回砂岩。此外，塔拉坎岛Meliat组顶部的薄层碳酸盐岩床位于西部和西南侧，将相变成厚的，发育较好的碳酸盐岩。

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