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首页> 外文会议>Indonesian Petroleum Association Annual Convention v.1; 20031014-20031016; Jakarta; ID >STRATIGRAPHIC RELATIONSHIPS OF A MIOCENE MIXED CARBONATE-SILICICLASTIC INTERVAL IN THE BADAK FIELD, EAST KALIMANTAN, INDONESIA
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STRATIGRAPHIC RELATIONSHIPS OF A MIOCENE MIXED CARBONATE-SILICICLASTIC INTERVAL IN THE BADAK FIELD, EAST KALIMANTAN, INDONESIA

机译：印度尼西亚东加里曼丹巴达克油田中新世混合碳酸盐-硅弹塑性层段的地层关系

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The Sanga Sanga PSC in the Kutai Basin of East Kalimantan is host to several gas and oil fields with hydrocarbons principally reservoired in Miocene fluvio-deltaic channel sandstones. Limestones form only a subordinate lithology in this area and carbonate development is restricted both temporally and spatially. The thickest and most extensive limestones are in the uppermost G interval of the Badak Field where several discrete horizons of limestones are interbedded with shales, sandstones and coals. Limestones exhibit an overall thickening upwards trend although individual limestones often display strong lateral variations in thickness and are notably absent from some wells. These limestones do not form reservoirs whereas laterally adjacent sandstones display similar production characteristics to carbonate-free intervals immediately above and below. An extensive blanket of thick shale in the basal F interval overlies this limestone bearing succession. Previous models explain the lateral contrast in limestone thickness as the product of variable erosion and incision during sea level low stands. An alternative origin is proposed whereby limestones have developed marginal to coeval siliciclastic channel-mouthbar systems. Evidence includes the location of these carbonates within an overall transgressive regime with limestone deposition terminated by deepening or increased admixed fine siliciclastic input rather than exposure. Individual limestones typically pass upwards and laterally into shale mouthbar deposits rather than erosively-based sandstones and there is no evidence of carbonate lags that might reflect local erosion. It is suggested that the lateral variation in limestone thickness reflects their original patchy development. Coeval siliciclastic deposition, although concentrated at mouthbars and channel levees, was also dispersed throughout the carbonate patch reef deposits. The predominantly clay grade fraction within the carbonates strongly influenced the biota present and the development of the patch reefs. This re-interpretation suggests that the poor reservoir quality of the carbonates reflects their overall transgressive nature and the high percentage of admixed fine grained siliciclastics. Alternative models fail to explain the paucity of secondary porosity that might otherwise develop during exposure in a tropical humid climate. Coeval shales may have provided argillaceous baffles that restricted the exchange of carbonate-bearing pore fluids into the coeval sandstones that have consequently retained reservoir quality.
机译：东加里曼丹省Kutai盆地的Sanga Sanga PSC拥有多个天然气田和油田，其油气主要储藏在中新世河三角洲河道砂岩中。石灰岩在该地区仅构成次要岩性，碳酸盐的发育在时间和空间上都受到限制。最厚，最广泛的石灰岩位于巴达克油田的最上层G区间，那里有几个离散的石灰岩层与页岩，砂岩和煤层合。石灰岩总体上呈增厚趋势，尽管单个石灰岩通常在厚度上表现出强烈的侧向变化，并且在某些井中明显缺乏。这些石灰岩没有形成储层，而横向相邻的砂岩表现出与上，下无碳酸盐岩层段相似的生产特征。在基底F层段上覆盖着厚厚的页岩层，覆盖着这个石灰岩承继层序。先前的模型解释了石灰石厚度的横向对比，这是海平面低位期间侵蚀和切割变化的产物。有人提出了一种替代性的起源，在这种起源中，石灰岩已发展到比同时期的硅质碎屑河道-道口系统更边缘。证据包括这些碳酸盐在整个海侵过程中的位置，而石灰石沉积则通过加深或增加混合的精细硅质碎屑输入而不是暴露来终止。单个的石灰岩通常向上并横向进入页岩储层，而不是侵蚀性的砂岩，并且没有证据表明碳酸盐滞后可能反映出局部侵蚀。建议石灰石厚度的横向变化反映了它们最初的斑片状发育。中世纪的硅质碎屑沉积物虽然集中在河口和河堤，但也分散在整个碳酸盐斑块沉积物中。碳酸盐中的主要粘土级分强烈影响存在的生物群和斑块礁的发育。这种重新解释表明，碳酸盐储层质量差反映了它们的整体侵略性和混合细粒硅质碎屑的高比例。替代模型无法解释在热带潮湿气候下暴露过程中可能会形成的次生孔隙的稀缺性。中世纪的页岩可能提供了泥质折流板，从而限制了含碳酸盐的孔隙流体向能够保留储层质量的中世纪的砂岩中的交换。

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