泥岩隔层发育背景下的河道砂岩气藏剩余气挖潜实践——以新场气田JS22气层为例

doi:10.13809/j.cnki.cn32-1825/te.2022.02.012

摘要/Abstract

摘要：

新场气田JS₂²气层为三角洲前缘亚相分流河道微相砂体沉积,部分砂体区域发育泥岩隔层,形成两期河道沉积,部分双层砂体发育气井仅射孔压裂其中一层,另一层砂体可能受泥岩隔层隔挡未被动用,但目前泥岩隔层分布规律认识不清,隔层垂向封隔性能尚未有先例验证,制约了该层剩余气的开发。通过建立JS₂²气层隔层测井曲线识别标准,对单井进行小层对比划分,开展隔层发育规模和平面分布规律研究,利用老井挖潜探索河道砂岩内部泥岩隔层垂向封隔性能。结果表明,泥岩隔层主要分布在JS₂²气藏东部,厚1~15 m,总体表现为两厚夹一薄特征。利用A1井挖潜实践,原未射孔压裂层经射孔和加砂压裂后增产明显,首次证实A1井区10 m泥岩隔层具有较好垂向封隔性能,该成果将对JS₂²气层剩余气开发提供新思路和实践依据,对提高整个气藏采收率具有重要意义。

关键词: 新场气田, JS₂²气层, 隔层, 剩余气, 老井挖潜

Abstract:

The JS₂² gas reservoir in the Xinchang Gas Field is the microfacies of distributary channel deposit in the delta front subfacies. The mudstone interlayer developed in some sandstone layers form the channel sediments twice. For some gas wells with double developed sand layers, the perforation and fracturing are carried out only in one of the two layers, while the rest may be blocked by mudstone interlayer, resulting in its untapped situation. However, the understanding of the distribution rule of the mudstone interlayer is unclear, and the sealing performance of interlayers hasn't been verified by precedent, limiting the development of the remaining gas in this reservoir. By the establishment of the logging curve identification standards of the interlayer, the interlayer of every single well is identified and divided, and the development scale and plane distribution rule of the interlayer are studied. And then, the old wells are used to explore the vertical sealing performance of the mudstone interlayer inside the channel sandstone. The study results show that the mudstone interlayer, with the thickness of 1~15 meters, is mainly distributed in the east of the JS₂² gas reservoir, and has the characteristic of one thin-line area laying between two thick areas along the distribution direction. In the application of potential tapping of Well-A1, the production obviously increase after the perforation and sand-fracture, firstly verifying that the mudstone interlayer with the thickness of 10 meters in A1 well area has better vertical sealing performance. This achievement will provide new ideas and practical basis for the development of remaining gas in the JS₂² gas reservoir, and is of great significance for improving the recovery rate of the entire gas reservoir.

Key words: Xinchang Gas Field, JS₂² gas reservoir, interlayer, remaining gas, potential tapping of old wells

中图分类号:

TE37

黎虹玮,袁剑,赵志川,周志林. 泥岩隔层发育背景下的河道砂岩气藏剩余气挖潜实践——以新场气田JS₂²气层为例[J]. 油气藏评价与开发, 2022, 12(2): 365-372.

LI Hongwei,YUAN Jian,ZHAO Zhichuan,ZHOU Zhilin. Practice of potential tapping of remaining gas in channel sandstone gas reservoir under the background of mudstone interlayers development: A case study of JS₂² gas layer in Xinchang Gas Filed[J]. Reservoir Evaluation and Development, 2022, 12(2): 365-372.

图/表 11

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类型	发育位置	产状	垂向规模	分布范围	油气水隔挡
隔层	砂层组间、砂层间	垂向加积	几十厘米至几十米	连续分布,大于气藏或气层50 %面积	隔挡性好
夹层	砂层间、单砂体间、单砂体内	加积、侧积、前积	几十厘米至几米	分布不连续,小于气藏或气层50 %面积	隔挡性差

测井位置	自然伽马（API）	密度（g/cm³）	补偿中子（%）	电阻率（Ω·m）	自然电位（mV）	声波时差（μs/m）
砂岩层	50~70	2.35~2.55	13~20	15~35	-100~50	212~278
隔层	75~95	2.50~2.65	9~16	12~22	-100~50	230~245
相对砂体变化	变大	变大	变小	变小	无差异	变小

挖潜潜力井	拟挖潜层位	砂体垂厚（m）	隔层垂厚（m）	测井数据								平面未动用指标
挖潜潜力井	拟挖潜层位	砂体垂厚（m）	隔层垂厚（m）	自然伽马（API）	声波时差（μs/m）	深侧向电阻率（Ω·m）	补偿中子（%）	密度（g/cm³）	孔隙度（%）	渗透率（10^-3μm²）	含水饱和度（%）	平面未动用指标
挖潜标准	JS₂^2-1或JS₂^2-2	≥13.0	≥5.0	40.0~75.0	≥213	16~50	8~18	2.30~2.60	≥5	≥0.20	≤80.0	与生产邻井距离大于邻井控制半径
A1	JS₂^2-1	22.4	10.5	60.5	242	16	11	2.35	11	0.59	45.5	598~1 008 m> 90~163 m

井名及层位		砂岩垂深（m）	砂岩岩性	泥岩隔层垂厚（m）	槽面显示（%）	钻时（min/m）	泥浆密度（g/cm³）	黏度（mPa·s）	气测全烃（%）	自然伽马（API）	声波时差（μs/m）
A1 （挖潜潜力井）	JS₂^2-1 （挖潜潜力层）	22.4	中砂岩	10.5	20	4~7	1.78下降至1.76	53上升至55	4.87上升至45.10	60.5	229
A1 （挖潜潜力井）	JS₂^2-2 （已射孔压裂）	15.7	细砂岩	10.5	25	10下降至4	1.78下降至1.76	53上升至56	9.96上升至58.97	59.5	253
A2	JS₂^2-1 （已射孔压裂）	22.2	中砂岩	3.7	20	2~3	1.70下降至1.69	46上升至47	0.94上升至76.98	57~74	239~255
A2	JS₂^2-2 （已射孔压裂）	22.2	中砂岩	3.7	20	2~7	1.71下降至1.70	43上升至44	6.13上升至66.36	68	252
A3	JS₂^2-1 （已射孔压裂）	23	细、中砂岩	6.5	20	12下降至1	1.91下降至1.76	32上升至50	0.33上升至11.77	60.3	256
A3	JS₂^2-2 （已射孔压裂）	22	细、中砂岩	6.5	20	6下降至2	1.75下降至1.71	32上升至50	1.94上升至5.8	66.3	260
井名及层位		深侧向电阻率（Ω·m）	浅侧向电阻率（Ω·m）	补偿中子（%）	密度（g/cm³）	孔隙度（%）	渗透率（10^-3μm²）	含水饱和度（%）	综合解释	动态储量（10⁴m³）	与A1井距离（m）
A1 （挖潜潜力井）	JS₂^2-1 （挖潜潜力层）	16	14.5	11	2.35	11.0	0.59	45.5	气层
A1 （挖潜潜力井）	JS₂^2-2 （已射孔压裂）	15	13.5	12	2.31	11.5	0.74	46.5	气层	803
A2	JS₂^2-1 （已射孔压裂）	23	21	11.5~13.0		12	0.53	45	气层	4 416	598
A2	JS₂^2-2 （已射孔压裂）	22	21	13.4		12	0.65	46	气层	4 416	598
A3	JS₂^2-1 （已射孔压裂）	18.2	16.5	13.6	2.42	13	0.58	43	气层	8 485	664
A3	JS₂^2-2 （已射孔压裂）	17.5	15.9	14.0	2.40	15	0.65	47	气层	8 485	664

泥岩隔层发育背景下的河道砂岩气藏剩余气挖潜实践——以新场气田JS₂²气层为例

Practice of potential tapping of remaining gas in channel sandstone gas reservoir under the background of mudstone interlayers development: A case study of JS₂² gas layer in Xinchang Gas Filed

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