库车坳陷东部阿合组地层水化学特征及其油气响应
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1.中国石油塔里木油田公司勘探开发研究院;2.中国石油大学北京油气资源与探测国家重点实验室;3.中国石油大学(北京)地球科学学院

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Hydrochemical Characteristics and Hydrocarbon Response of Formation Water of Ahe Formation in Eastern Kuqa Depression
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1.Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company;2.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum;3.College of Geosciences, China University of Petroleum

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    摘要:

    【研究目的】地层水作为油气运移的载体,对油气成藏具有重要意义。塔里木盆地库车坳陷东部侏罗系阿合组油气藏的油水分布关系复杂,地层水特征及其与油气藏的关系缺少系统研究。【研究方法】为了明确地层水化学特征及其与油气藏之间的关系,在对地层水样品进行筛选的基础上,对库车东部阿合组的地层水测试数据进行分析,研究地层水的水型、矿化度、离子比例系数的分布特征及其油气意义。【研究方法】研究结果表明:阿合组的地层水主要为NaHCO3型,其次为CaCl2型和MgCl2型,矿化度相对较低。地层水的矿化度、离子比例系数具有受构造控制的特点:在构造的开启区、地层的尖灭区,地层水主要为低矿化度的NaHCO3型,钠氯系数、脱硫酸系数较高且变质系数为负值,而封闭性的地层中地层水具有相反的化学特征。【结论】地层水化学特征与油水层的平面分布特征有较好的耦合关系,以迪北油气藏为例,依奇克里克断裂以北虽经历过油气的充注,但已经生成的油气沿着断裂逸散,低矿化度、高钠氯系数、高脱硫酸系数、低变质系数及高高岭石含量可以看出地层受到了沿断裂进入地层的大气降水的影响;而断裂以南相反的地层水化学特征及高岭石含量反映地层封闭性较好,受大气降水影响小,对应了气藏的分布。地层水的化学特征与油气藏的分布关系为后续致密油气藏的勘探开发和评价提供了一定依据。

    Abstract:

    The distribution relationship between oil and water in Ahe Formation of Jurassic in the eastern Kuqa Depression, Tarim Basin is complicated, and the characteristics of formation water and its relationship with oil and gas reservoirs are lack of systematic study. In order to clarify the chemical characteristics of formation water and its relationship with reservoirs, based on the selection of formation water samples, the formation water test data of Ahe Formation in eastern Kuqa Depression are analyzed to study the distribution characteristics of water type, TDS and ionic ratio coefficients of formation water and its significance to reservoirs. The results show that the formation water of J1a is mainly NaHCO3 type,followed by CaCl2 type and MgCl2 type, and has relatively low salinity. The TDS and ionic ratio coefficients of formation water are controlled by the structure characteristics: In the open area of the structure and the pinch-out area of the formation, the formation water is mainly NaHCO3 type with low salinity, the sodium chloride coefficient and desulfurization coefficient are high and the deterioration coefficient is negative. Nevertheless, the formation water in the closed formation has the opposite chemistry feature. There is a good coupling relationship between the chemical characteristics of formation water and the plane distribution characteristics of oil and water, with Dibei oilfield as an example, although YN4 and YS4 wells had experienced oil and gas filling, but the formed oil and gas escaped along the fault, and the chemical characteristics of the formation water and the kaolinite content reveal that the formation was affected by the meteoric water that entered along the fault. On the contrary, the chemical characteristics of formation water and kaolinite content in well YN2 indicate that the formation is well sealed and less affected by meteoric water, which corresponds to the distribution of oil layers. The relationship between the chemical characteristics of formation water and the distribution of oil and gas reservoirs provides a basis for subsequent exploration, development and evaluation of tight oil and gas reservoirs.

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  • 收稿日期:2021-08-30
  • 最后修改日期:2021-10-22
  • 录用日期:2021-11-08
  • 在线发布日期: 2023-02-24
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