Abstract

This paper is focused on the detailed lithostratigraphic facies characterisation of the paleo-environments of the uppermost Silurian through Lower Devonian Winduck Interval strata from the Bancannia South 1, Pondie Range 1 and Booligal Creek 1 and 2 wells, across the central Darling Basin of western New South Wales. Based on data from both wireline logs and drill cores and cuttings, an interpretation of paleo-environments and evolution of the depositional facies is presented. Our approach involves two key interpretations. The first outcome was the delineation of the Winduck Interval section (maximum observed thickness of approximately 1475 m) and formal subdivision into lower and upper Winduck Intervals, based on well data from the central Bancannia Trough, southern Pondie Range Sub-basin and northwestern flank of the Blantyre Sub-basin. The second outcome is based on the internal lithostratigraphy of the Winduck Interval represented by 11 sedimentary lithofacies organised into three lithofacies associations (LFAs). LFA-X1 is interpreted as distributary-channel sandstone complex deposits, LFA-X2 is interpreted as distributary mouth bar with small-scale braided delta plain complex deposits and LFA-X3 is interpreted as tidal channel sands with proximal delta front complex deposits. Subsurface lithostratigraphic facies analysis relationships and depositional environments of the Winduck Interval section have implications for evaluating the hydrocarbon potential and may assist future exploration efforts in the central Darling Basin, especially the Bancannia Trough and Pondie Range Sub-basin.

1. KEY POINTS

2. A detailed lithostratigraphic facies characterisation of the paleo-environments of the uppermost Silurian–Lower Devonian Winduck Interval strata in the central Darling Basin is presented.

3. Evaluation and interpretation of the Winduck Interval section in study area was subdivided into two informal stratigraphic units, a lower Winduck Interval and an upper Winduck Interval.

4. Eleven distinct sedimentary lithofacies codes (LFs), which have been recognised in the internal lithostratigraphy of the Winduck Interval from the Bancannia South 1, Pondie Range 1 and Booligal Creek 1 and 2 wells, have been grouped into three lithofacies associations (LFAs).

5. Lithostratigraphic facies analysis relationships and depositional environments of the Winduck Interval section has implications for evaluating the hydrocarbon potential and may assist future exploration in the Bancannia Trough and Pondie Range Sub-basin.

摘要

本文着重研究了新班西西部达令盆地中部Bancannia South 1，Pondie Range 1和Booligal Creek 1和2井最上志留纪至下泥盆纪温德克间隔地层古环境的详细岩相地貌特征。南威尔士。基于电缆测井，钻芯和钻屑的数据，对古环境和沉积相演化进行了解释。我们的方法涉及两个关键的解释。第一个结果是对温德克区间剖面的描绘（观察到的最大厚度约为1475 m）并根据来自班坎尼亚海槽中部，庞迪山脉次盆地南部和布兰太尔次盆地西北侧的井资料，正式划分为上下温德克区间。第二个结果是基于温德克区间的内部岩相地层学，该岩层学由11个沉积岩相组成，并组织为3个岩相协会（LFAs）。LFA-X1被解释为分流河道砂岩复合物矿床，LFA-X2被解释为具有小规模辫状河三角洲平原复合物矿床的分流河口坝，而LFA-X3被解释为潮汐河道砂岩，具有近端三角洲前部复合物矿床。

1. 关键点

2. 给出了达令盆地中部最志留纪-下泥盆纪温德克区间地层古环境的详细岩相地貌特征。

3. 研究区域的温德克区间段的评价和解释又分为两个非正式地层单元，较低的温德克区间和较高的温德克区间。

4. 在Bancannia South 1，Pondie Range 1和Booligal Creek 1和2井的Winduck区间的内部岩相地层学中，已识别出11个不同的沉积岩相编码（LFs），将其划分为三个岩相学协会（LFAs）。

5. Winduck间隔段的岩石地层相​​分析关系和沉积环境对评价油气潜力具有重要意义，并可能有助于在Bancannia槽和Pondie Range次盆地进行未来的勘探。