中江气田窄河道致密砂岩气藏高效开发技术

doi:10.13809/j.cnki.cn32-1825/te.2022.02.010

摘要/Abstract

摘要：

中江气田沙溪庙组气藏高效开发面临着河道精细刻画、高产富集模式建立、开发技术政策制定、工程压裂改造技术配套4大难点。针对窄河道砂采用多域多属性精细刻画及储层精准预测技术,对多期叠置河道砂空间展布特征刻画效果较好,实现了最薄8 m、最窄50 m河道砂的刻画,且河道砂的沉积时间顺序也非常清晰,采用基于射线参数域的改进三参数叠前反演技术实现了薄层高精度定量预测,储层厚度、孔隙度预测误差均低于10 %;通过建立烃源岩断层与河道砂有效搭配模式,古今构造高或古构造高、今构造低,同时储层物性好的区域有望获得气井高产、稳产;采用井组立体部署、井型优选及水平井优化设计等技术,极大提升了窄河道致密砂岩气藏储量动用程度,同时节约了投资成本;采用地质工程一体化水平井分段压裂改造技术,单井测试产气量稳步提升,改造效果提高至实施前的10.6倍。所形成的窄河道致密砂岩气藏高效开发技术实现了中江气田的高效勘探开发,建成了年产气量超10×10⁸m³的中国石化川西第一大气田。

关键词: 窄河道, 一体化, 高效开发, 致密砂岩气藏, 中江气田

Abstract:

Efficient development of Zhongjiang gas reservoir is faced with four difficulties: the meticulous channel depiction, the establishment of high-yield enrichment mode, the formulation with development technology policy, and corresponding engineering fracturing technology. For the narrow channel sand bodies, the multi-domain and multi-attribute fine description and accurate reservoir prediction technology are used, and the spatial distribution characteristics of multi-stage and overlapping channel sand bodies are well described. It can depict the channel sand bodies of the thinnest 8 m and the narrowest 50 m, and the sedimentary time sequence of each channel sand body is also very clear. An improved three-parameter pre-stack inversion technique based on ray parameter domain is used to realize the high-precision quantitative prediction of thin-layer, the predicted error of reservoir thickness and porosity is less than 10 %. By establishing an effective combination model of source rock fault and channel sand, with high ancient and modern structures or high ancient and low modern structures, and good reservoir physical properties, it is expected to obtain high and stable production of gas wells in these areas. By using the techniques of 3D deployment of well groups, well pattern optimization and horizontal well optimization design, the production degree of tight sandstone gas reservoir in narrow channel is greatly enhanced, and the investment cast is saved. By using the integrated horizontal well fracturing technology, the single well test gas production is steadily increased, and the transformation effect is increased to 10.6 times before implementation. High-efficiency development technology of tight sandstone gas reservoir formed by narrow channel enables efficient exploration and development of the Zhongjiang Gas Field, the largest gas field of Sinopec in western Sichuan, with an annual gas production of more than 1 billion cubic meters.

Key words: narrow channel, integration, efficient development, tight sandstone reservoir, Zhongjiang Gas Field

中图分类号:

TE357

刘成川,王勇飞,毕有益. 中江气田窄河道致密砂岩气藏高效开发技术[J]. 油气藏评价与开发, 2022, 12(2): 345-355.

Chengchuan LIU,Yongfei WANG,Youyi BI. Efficient development technique of tight sandstone gas reservoir in narrow channel of Zhongjiang Gas Field[J]. Reservoir Evaluation and Development, 2022, 12(2): 345-355.

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渗透率（10^-3μm²）	直井/水平井对比	推荐井型
>5.0	水平井开发效益不明显	直井
1.0~5.0	水平井开发有一定增产效果,但经济效益仍不如直井	直井
0.5~1.0	直井开发可达经济下限标准,水平井开发效益相对较好	水平井
0.1~0.5	直井开发产量偏低,水平井增产效果最佳	水平井
0.05~0.10	直井开发无效益,水平井开发经济效益差	水平井
<0.05	直井、水平井开发均无效益

河道类型		储层类型	河道宽度（m）		有效厚度（m）		有效渗透率（10^-3μm²）
河道类型		储层类型	范围	平均	范围	平均	范围	平均
宽厚低渗型	Ⅰ-A类	Ⅰ	450~1 000	600	20.0~35.0	26.5	0.20~1.25	0.52
宽厚低渗型	Ⅰ-B类	Ⅰ	300~600	400	17.0~26.0	20.2	0.10~1.01	0.41
薄窄/致密型	Ⅱ-A类	Ⅱ	250~530	360	11.0~34.0	23.5	0.02~0.31	0.15
薄窄/致密型	Ⅱ-B类	Ⅰ	220~300	240	8.0~19.6	12.8	0.07~0.65	0.36
高含水致密型	Ⅲ-A类	Ⅱ、Ⅲ			9.3~19.5	14.0	0.03~0.10	0.07
高含水致密型	Ⅲ-B类	Ⅱ、Ⅲ					<0.1