| 中深层砂砾岩储层控制因素与分类评价方法 ——以东营凹陷永1块沙四下亚段为例 |
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| 引用本文： | 王淑萍,王铸坤,操应长,王艳忠,杜亮慧,李宇志.中深层砂砾岩储层控制因素与分类评价方法 ——以东营凹陷永1块沙四下亚段为例[J].沉积学报,2019,37(5):1069-1078. |
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| 作者姓名： | 王淑萍 王铸坤 操应长 王艳忠 杜亮慧 李宇志 |
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| 作者单位： | 中国石油大学(华东)石油工业训练中心,山东青岛,266580;中国石油大学(华东)地球科学与技术学院,山东青岛,266580;中国石化胜利油田分公司鲁胜石油开发有限责任公司,山东东营,257077;中国石化胜利油田分公司东辛采油厂,山东东营,257094 |
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| 基金项目： | 国家科技重大专项（2016ZX05006-003）；国家自然科学基金项目（41772137） |
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| 摘 要： | 东营凹陷永1块沙四下亚段中深层砂砾岩储层控制因素认识不清、分类评价方法不明确，已成为油气滚动勘探过程中亟需解决的瓶颈问题。综合运用三维地震解释、岩芯观察、薄片鉴定、物性分析、试油分析等方法，对该区沙四下亚段储层储集特征、控制因素及分类评价进行系统研究。研究表明:砂砾岩储层发育的控制因素为岩相、成岩相及裂缝。岩相是储层发育的主控因素，最有利岩相为砂岩相、含砾砂岩相，中等有利岩相为砾岩相、砾质砂岩相，不利岩相为粉砂岩相、泥质/灰质砂岩相。成岩相促进储层物性分异，有利成岩相为溶解主控型成岩相，中等有利成岩相为压实主控型成岩相，不利成岩相为胶结主控型及杂基支撑主控型成岩相。构造高部位发育的大量裂缝对储层具有明显改造作用，距离古隆起脊线越近储层物性变好。以储层特征与控制因素组合为基础，将研究区沙四下亚段砂砾岩储层划分为Ⅰ类、Ⅱ1类、Ⅱ3类、Ⅲ2类、Ⅲ3类、Ⅳ类等4大类6小类。其中Ⅰ类储层物性最好，产能最高，为优质储层；Ⅱ1类、Ⅱ3类储层物性中等，产能中等，为中等储层；Ⅲ2类、Ⅲ3类储层物性较差，产能较低，为差储层；Ⅳ类储层物性最差，产能最低，为无效储层。
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| 关 键 词： | 储层特征 储层分类 储层评价 砂砾岩 沙四下亚段 沙河街组 东营凹陷 |
| 收稿时间： | 2019-04-01 |
Controlling Factors and Evaluation of the Medium-deep Glutenite Reservoirs: An example from the lower part of the fourth member of the Paleogene Shahejie Formation in the Yong1 block,Dongying Sag |
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| Institution: | 1.Petroleum Industry Training Center, China University of Petroleum(East China), Qingdao, Shandong 266580, China;2.School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;3.Lusheng Petroleum Development Company Ltd., Shengli Oilfield Branch Company Ltd., SINOPEC, Dongying, Shandong 257077, China;4.Dongxin Oil Plant, Shengli Oilfield Branch Company Ltd., SINOPEC, Dongying, Shandong 257094, China |
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| Abstract: | Uncertainty as to the controlling factors and classification methods for the medium-to-deep glutenite reservoirs in the lower member of Shahejie Formation in the Yong1 block,Dongying Sag,has been a bottleneck for oil and petroleum exploration efforts. To determine the characteristics,controlling factors and methods of classifying and evaluating glutenite reservoirs,the reservoirs were examined by a variety of techniques,including 3D seismic interpretation,core and thin section observation,reservoir property analysis and oil testing. A combination of lithofacies, diagenetic facies and fractures controlled the reservoir formation. Of these,lithofacies is the primary factor. The most favorable are sandstone and pebbly sandstone. Conglomerate and gravelly sandstone are less favorable,and the least useful are siltstone,muddy sandstone and calcareous sandstone. Diagenetic facies enhance the heterogeneity of reservoirs. The most favorable of these is mainly controlled by moderate to strong dissolution;those that are mainly controlled by compaction are moderately favorable;and the least favorable diagenetic facies are mainly controlled by cementation and high matrix content. In the highest structural part of the structure,fractures improve reservoir properties,tending to have better properties closer to the structural line. Based on reservoir characteristics and combinations of all the controlling factors,glutenite reservoirs are divided into four types and six subtypes. Type Ⅰ (combination of favorable lithofacies,diagenesis and tectonic location)reservoirs possess the best properties and have the highest oil output;these are classified as high-quality reservoirs. Type Ⅱ1 (combination of favorable lithofacies,diagenesis and adverse tectonic location) or Ⅱ3 (combination of favorable diagenesis,tectonic location and adverse lithofacies)reservoirs have medium properties and medium oil output,which of moderate quality. Type Ⅲ2 (combination of adverse diagenesis,lithofacies and favorable tectonic location)or Ⅲ3 (combination of adverse diagenesis,tectonic location and favorable lithofacies)reservoirs have quite poor properties and low output of low-quality oil. Finally, Type Ⅳ (combination of adverse lithofacies,diagenesis and tectonic location)reservoirs have the poorest properties and lowest output, and are classified as ineffective reservoirs. |
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