Fracture characteristics and water invasion patterns of Dina-2 gas reservoir, Tarim Basin

MAO JINXIN; XIE XINHUI; DENG HUCHENG; WANG ZHIMIN; LI PENG; WU YONGPING; XIANG ZEHOU; ZHANG XIN

doi:10.13809/j.cnki.cn32-1825/te.2024488

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Fracture characteristics and water invasion patterns of Dina-2 gas reservoir, Tarim Basin
Vol. 16, Issue 2, Pages: 423-433(2026)
Received：11 February 2025，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2024488
稿件说明：

移动端阅览

毛金昕, 解馨慧, 邓虎成, 等. 塔里木盆地迪那2气藏裂缝特征与水侵规律[J]. 油气藏评价与开发, 2026, 16(2): 423-433. DOI： 10.13809/j.cnki.cn32-1825/te.2024488.

MAO Jinxin, XIE Xinhui, DENG Hucheng, et al. Fracture characteristics and water invasion patterns of Dina-2 gas reservoir, Tarim Basin[J].Petroleum Reservoir Evaluation and Development, 2026, 16(2): 423-433. DOI： 10.13809/j.cnki.cn32-1825/te.2024488.

摘要

迪那2气藏为塔里木盆地一大型边水致密砂岩气藏，储层非均质性强，天然裂缝是影响其高产和水侵的重要因素。裂缝研究对明确气藏水侵规律及防控水政策的制定意义重大。研究基于岩心、薄片、成像测井等地质资料，分析天然裂缝地质静态特征。结合产水、产气、压力等生产动态特征，分析不同因素对水侵的影响，利用层次分析法明确控制因素，研究不同形态构造裂缝对水侵特征影响，建立气藏水侵模式。研究结果表明：研究区构造裂缝分为剪切裂缝和张性裂缝，以充填裂缝为主，充填物主要为方解石，其次是石英和黏土等，但开度较大；根据生产动态特征可以分为早期暴性水淹井、晚期暴性水淹井、带水生产井和无水生产井，4种类型生产井生产特征明显不同；依据生产特征和地质特征，从构造位置、断层、隔层、地层系数和裂缝5个因素对研究区气藏主控因素分析，明确裂缝为主要因素，断层、隔层、地层系数为次要因素，构造位置为无关因素，利用层次分析法建立水侵综合评价指数；结合裂缝形态差异及生产特征，明确了复杂裂缝对气井高产及产水的影响。以此建立了优势裂缝型、断缝体局限型和优势裂缝-断层-砂体组合型的3种水侵模式，总结气藏水侵规律。研究成果对类似气藏开发具有一定的指导意义，为同类型有水气藏水侵规律研究和开发评价提供借鉴。

Abstract

The Dina-2 gas reservoir is a large edge-water tight sandstone gas reservoir in the Tarim Basin

with strong reservoir heterogeneity. Natural fractures are key factors influencing its high production and water invasion. Investigating fractures is crucial for understanding the water invasion patterns and formulating water control strategies for the gas reservoir. Based on geological data including core samples

thin sections

and imaging logs

this study analyzed the static geological characteristics of natural fractures. By combining production dynamic characteristics including water production

gas production

and pressure

this study analyzed the influence of different factors on water invasion. The analytic hierarchy process was used to identify the controlling factors

and the influence of structural fractures with different morphologies on water invasion characteristics was studied

and water invasion patterns for the gas reservoir were established. The results showed that structural fractures in the study area were classified into shear fractures and tensile fractures

with filled fractures being dominant. The fillings were mainly calcite

followed by quartz and clay minerals

but the fracture apertures were relatively large. Based on production dynamic characteristics

the production wells were categorized into four types: early-stage violent water-flooded wells

late-stage violent water-flooded wells

water-producing wells

and water-free wells

each with significantly different production characteristics. Based on the production and geological characteristics

the main controlling factors for water invasion in the gas reservoir were analyzed considering five factors: structural position

faults

interlayers

formation coefficient

and fractures. Fractures were identified as the primary controlling factor

with faults

interlayers

and formation coefficient as secondary factors

and structural position as irrelevant. A comprehensive water invasion evaluation index was established using the analytic hierarchy process. By considering fracture morphology differences and production characteristics

this study clarified the influence of complex fractures on high gas production and water production in gas wells. Accordingly

three water invasion patterns were established: dominant fracture-controlled type

fault-fracture compartment-controlled type

and dominant fracture-fault-sandbody composite type

summarizing the water invasion patterns of the gas reservoir. These findings provide strategic guidance for the development of similar gas reservoirs and offer valuable insights for studying water invasion patterns and development evaluation in similar water-bearing gas reservoirs.

关键词

Keywords

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