Characteristics and main controlling factors of the sweet spot reservoir in the first member of Lower Shihezi Formation of well J58 in Hangjinqi area, Ordos Basin
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摘要: 一直以来,鄂尔多斯盆地杭锦旗地区二叠系下石盒子组一段(盒一段)致密砂岩气甜点储层的特征及主控因素不明确,制约着此地区天然气的产能。本文综合运用岩芯观察、铸体薄片、压汞实验及测井资料等方法,对鄂尔多斯盆地杭锦旗地区J58井区盒一段致密高产储层的岩石学特征、储层物性、沉积相及成岩作用进行研究,识别并划分研究区盒一段有利区沉积-成岩相类型,建立测井响应特征与沉积成岩相之间对应关系模式,探讨J58井区沉积微相控制型甜点发育规律及主控因素。结果表明,杭锦旗地区储层在整体致密的背景下仍发育较多甜点区; 高产气区岩性以岩屑砂岩和岩屑石英砂岩为主,颗粒大、分选好,原始沉积环境以水动力强的三角洲-辫状河为主; 甜点区主要受控于沉积相,甜点储层主要发育在高能沉积相带和有利的成岩作用相带,甜点储层的预测与评价集中在中弱压实-岩屑溶蚀成岩相和高能心滩沉积微相叠合区。Abstract: For a long time, the characteristics and main controlling factors of the sweet spot reservoir of tight sandstone gas in the first member of the Shihezi Formation in Hangjinqi area of Ordos Basin are not clear, which restricts the natural gas productivity in this area.Core observations, rock slice image, mercury intrusion experiments and logging data, etc.are used comprehensively to determine the petrological characteristics, reservoir physical properties, sedimentary facies and diagenesis of the tight and high-yield reservoir in the first member of the Lower Shihezi Formation in well J58 block of the Hangjinqi area, Ordos Basin.In-depth research was carried out to identify and classify the favorable sedimentary-diagenetic facies types of the first member of the Lower Shihezi Formation in the study area to establish the corresponding relationship between logging response characteristics and sedimentary diagenetic facies, and discuss the development law and main controlling factors of sedimentary microfacies controlled sweet spots in well J58 block.The results show that there are still many sweet spots in the reservoir of Hangjinqi area under the condition of compact rock formation.The lithology of high gas producing area is mainly litharenite and lithic quartzite, with large particles and good sorting.The original sedimentary environment is mainly braided stream delta with strong hydrodynamic force.Besides, dessert area is mainly controlled by sedimentary facies, and it is mainly developed in high-energy sedimentary facies and favorable diagenesis facies.The prediction and evaluation of dessert reservoir focus on the medium weak compaction debris dissolution diagenetic facies and high-energy beach sedimentary microfacies.
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图 2 J58井区盒一段甜点储层岩芯
(a) J98井,3 062.55 m,灰白色含砾粗砂岩; (b)J101井,3 021.00~3 029.00 m,灰白色含砾粗砂岩; (c)J111井,3 001.98 m,浅灰色细砾岩; (d)J95井,3 205.00 m,灰绿色砂砾岩; (e)J101井,3 021.00~3 029.00 m平行层理; (f)J110井,3 024.43~3 024.57 m,水平层理; (g)J98井,3 082.71~3 082.98 m,粒序层理
Figure 2. Core diagram of the sweet spot reservoir in the first member of Lower Shihezi Formation in well J58 area
表 1 J58井区盒一段甜点储层陆源碎屑含量
Table 1. Content of terrigenous debris in the sweet spot reservoir of the first member of Lower Shihezi Formation in well J58 area
% 样品编号 石英 燧石 长石 岩屑 云母 钾长石 斜长石 火成岩 变质岩 沉积岩 J89-13 57 2 1 — 8 30 — 2 J89-14 55 1 1 — 6 36 — 1 J89-15 56 1 — — 6 36 — 1 J89-16 57 1 — 1 6 33 — 2 J95-1 55 1 — — 10 31 — 3 J95-2 58 — 1 — 9 30 — 2 J95-3 64 — — 1 6 27 — 2 J95-4 62 — — 1 8 28 — 1 J115-6 60 4 3 — 7 25 2 — J115-7 62 2 2 — 5 28 2 — J115-8 65 3 2 — 4 26 1 — J115-9 60 3 2 — 9 24 2 — 表 2 J58井区盒一段高压压汞结果数据
Table 2. Data of high-pressure mercury injection results in the first member of Lower Shihezi Formation in well J58 area
样品号 孔隙率/% 渗透率/mD 中值压力/MPa 平均孔喉半径/μm 排驱压力/MPa 最大孔喉半径/μm 分选系数 结构系数 最大进汞饱和度/% 退汞效率/% J98-1 14.04 2.220 8.377 0.308 0.591 1.244 0.342 0.749 85.87 58.43 J98-2 8.79 1.510 19.697 0.246 0.511 1.439 0.357 0.440 81.13 52.31 J98-4 9.30 0.642 20.976 0.147 0.859 0.856 0.202 0.392 88.78 48.60 J98-7 5.98 0.466 19.592 0.168 0.922 0.798 0.194 0.452 75.48 42.66 J103-20 8.69 0.545 21.605 0.283 0.613 1.200 0.320 0.160 71.68 42.06 J103-21 14.63 1.510 11.645 0.474 0.417 1.764 0.475 0.272 70.00 37.10 J103-22 8.16 0.353 28.534 0.183 0.899 0.818 0.215 0.097 71.21 43.22 J103-23 11.74 0.810 7.703 0.421 0.520 1.413 0.407 0.321 76.99 38.17 J111-1 8.33 0.414 23.032 0.089 0.709 1.058 0.112 0.198 89.23 45.07 J111-2 4.12 1.134 20.930 0.252 0.430 1.746 0.297 0.289 85.39 34.58 J111-5 2.83 0.072 25.746 0.058 1.470 0.510 0.058 0.165 81.45 40.04 J111-6 8.01 0.408 16.444 0.096 0.643 1.167 0.122 0.227 89.88 41.57 -
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