准噶尔盆地腹部石南地区侏罗系薄砂体识别方法研究

A Study on Identification Method of Jurassic Thin Sand Formation in Shinan Area of Dzungar Basin

摘要: 准噶尔盆地腹部石南地区侏罗系头屯河组(J₂t)与三工河组(J₁s)薄砂层是主要油气高产层系之一，但目前地震资料难以刻画岩性圈闭，为此，应用基于地质目标分时分频迭代处理解释一体化技术，针对石南地区薄砂体储层特征建立处理和解释之间相互渗透、迭代递进的研究模式，开展岩性圈闭预测和目标评价工作。首次准确识别了准噶尔盆地腹部J₂t砂体尖灭线，验证了“古隆控砂”成藏模式；发现了一系列构造岩性圈闭，新部署实施的石603井J₂t获日产34.9 t高产油流，新增探明储量301.22 × 10⁴ t；新部署实施的石607井J₁s₂¹获日产5.67 × 10⁴ m³高产工业气流，预测天然气地质储量30.97 × 10⁸ m³，为准噶尔盆地腹部侏罗系下一步滚动勘探开发开拓了新领域。

Abstract: The thin sandstones from Toutunhe Formation (J₂t) and Sangonghe Formation (J₁s) of Jurassic in the Shinan area of the central Dzungar Basin are one of the main oil-gas producing strata. However, at present, it is difficult to characterize lithologic traps with seismic data. Based on the integration technology of time-division and frequency-iteration processing and interpretation of geological objects, a research model of mutual infiltration and iterative progression between processing and interpretation of thin sandstone reservoir in the Shinan area was established, and lithologic trap prediction and target evaluation were carried out. The pink-out line of the sand body of Toutunhe Formation (J₂t) in the central Dzungar Basin was accurately identified for the first time, and the accumulation model of “Paleo uplift sand control” was verified. In addition, a series of structural lithologic traps were found. The newly deployed J₂t of well SHI603 has 34.9 t/d high-yield oil flow and 301.22 × 10⁴ t new proved reserves. The newly deployed well J₁s₂¹ of well SHI 607 has a daily production of 5.67 × 10⁴ m³ high-yield industrial gas flow, and the predicted geological reserves of natural gas are 30.97 × 10⁸ m³, which opened up a new field for further rolling exploration and development of Jurassic in the Dzungar Basin.