收稿：2025-02-11，
纸质出版：2026-03-26
移动端阅览
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。
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.
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