Oil and gas exploration breakthroughs and insights in the western segment of Silurian Shajingzi structural belt in Tarim Basin
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摘要: 塔里木盆地西北部志留系油气勘探程度较低,2019—2021年,新苏地1井、新苏参1井首次在沙井子构造带东段获得油气发现,2023年向西拓展的新苏地2井也试获工业气流。基于沙井子地区钻探、试油、地球化学及地质特征等资料和野外剖面测量结果,结合二维地震资料目标处理与精细解释,开展了成藏模式分析和资源潜力评价,研究认为: ①沙井子构造带志留系柯坪塔格组发育大型砂体,储盖组合好,西段新苏地2井、东段新苏参1和新苏地1井均获得工业气流,揭示了志留系油气潜力; ②沙井子断裂系统规模大,活动时间长,既沟通阿瓦提凹陷深部优质烃源岩,又控制沙井子构造带一系列构造、构造-岩性类圈闭的形成,成藏期以圈闭定型后的喜马拉雅期为主,表现为“断裂主控、晚期成藏”的特征; ③识别沙井子构造带志留系柯坪塔格组圈闭42个,预测圈闭资源量1.982 1亿t油当量,油气勘探潜力较大。研究成果可为下一步开展勘探区评价提供借鉴和依据。Abstract: The exploration degree of Silurian oil and gas in the northwestern part of Tarim Basin was relatively low. The oil and gas discovery was obtained in the eastern segment of Shajingzi structural belt from wells XSD 1 and XSC 1 from 2019 to 2021, and then the industrial gas flow was also achieved in XSD 2 well, which extended westward in 2023. Based on the analysis of drilling, oil testing, geochemical, geological characteristics in Shajingzi area and the results of field profile measurements, and combined with the targeted processing and detailed interpretation of 2D seismic data, the authors in this paper conducted an analysis of the reservoir formation model and evaluation of resource potential. The results are as follows. ① Large sand bodies were developed in Silurian Kepingtage Formation in Shajingzi structural belt, with favorable reservoir-seal assemblages. The wells XSD 2 in the eastern segment, XSC 1 and XSD 1 in the western segment, have all achieved industrial gas flow, revealing the oil and gas potential of Silurian strata; ② Shajingzi fault system is large in scale and long in duration, connecting the high-quality source rocks in the deep part of Awati depression. This fault system also controls the formation of a series of structural traps and structural-lithology traps in Shajingzi structural belt. The reservoir formation period is mainly Himalayan period after the traps were formed, characterized by “fault-dominated, late-stage reservoir formation”; ③ Forty-two traps have been identified in Silurian Kepingtage Formation of Shajingzi structural belt, with a predicted trap resource volume of 198.21 million tons oil equivalent, indicating significant oil and gas exploration potential. The results of the study could provide some references and basis for the next step in the evaluation of the exploration area.
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