Comprehensive Identification of Fractured-Vuggy Reservoirs in Tahe Oilfield

doi:10.7657/XJPG20230215

Abstract

Abstract:

In order to realize the identification of the connected fractured-vuggy structures in the Tahe oilfield，based on the seismic interpretation results of large-scale reservoirs，together with the drilling，logging，testing，tracer and other data，the reservoir types in near-well and inter-well areas were identified. By identifying the reservoirs with static and dynamic monitoring methods，the characteristic parameters of the dynamic methods for identifying reservoirs in fractured-vuggy units were determined to improve the reliability of the identification. Depending upon the types of reservoirs identified with static and dynamic methods，the connected fractured-vuggy structures were constructed according to their in spatial position relationship. The application in the identification of single-well fractured-vuggy structures in the X unit reveals that the proposed comprehensive method is more reliable in identification of fractured-vuggy structure than a single static or dynamic method.

Key words: Tahe oilfield, fractured-vuggy reservoir, reservoir type, well, near-well, inter-well, reservoir identification, fractured-vuggy structure

CLC Number:

TE344

WU Bo, YANG Wendong, LYU Jing, LUO Junlan. Comprehensive Identification of Fractured-Vuggy Reservoirs in Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(2): 238-244.

Figures/Tables 9

Table 1.

Fig. 1.

Table 2.

Table 3.

Fig. 2.

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储集层类型	酸压压力	产液量变化	含水变化	生产动态	注水量/ (m³·MPa^-1)
溶洞型	注冻胶、酸液阶段有沟通缝洞显示，泵压下降≥12.0 MPa，停泵压力≤10.0 MPa，压降2.2~8.3 MPa	稳产期≥650 d，稳定产液量≥40 t/d，后期缓慢下降，累计产液量≥7×10⁴ t	开井未见水，无水采油期≥8个月，见水后快速上升开井见水，含水波动变化	自喷期≥8个月，采液量≥0.50×10⁴ t/MPa，油压下降速度≤0.6 MPa/a 机抽期动液面≤300 m，采液量≥0.60×10⁴ t/hm	≥26 000
缝洞型	注冻胶、酸液阶段有沟通小缝洞显示，泵压下降3.5~7.0 MPa，停泵压力13.0~22.0 MPa，压降1.6~2.4 MPa	稳产期138~398 d，稳定产液量22~30 t/d，后期较快下降，累计产液量4.9×10⁴~6.4×10⁴ t	开井未见水，无水采油期2~7个月，见水后缓慢上升开井见水，含水波动变化	自喷期≥8个月，采液量0.10×10⁴~0.40×10⁴ t/MPa，油压下降速度3.2~7.1 MPa/a 机抽期动液面300~700 m，采液量0.20×10⁴~0.40×10⁴ t/hm
裂缝型	注冻胶、酸液阶段显示滤失特征，泵压下降≤2.0 MPa，停泵压力≥20.0 MPa，压降0.3~4.0 MPa	无稳产期，产液快速下降，累计产液量≤4.4×10⁴ t	开井油水同出，暴性水淹	自喷期≤2个月，采液量≤0.05×10⁴ t/MPa，油压下降速度≥14.0 MPa/a 机抽期动液面≥1 800 m，采液量≤0.02×10⁴ t/hm	≤300

形态特征	井数/口	储集体结构特征	生产特征	主要分布区块
“V”字型	20	垂向裂缝较发育，溶洞型储集层规模较大	初期高产且供液充足，但易发生暴性水淹	11区、托甫台、跃进、顺北
双下凹型	22	具有多套溶洞型储集体，储集层规模中等	大多供液较充足	风化壳岩溶区
后期下掉型	17	沟通一定规模的单套储集层	初期平均日产油68.0 t	7区、12区
上升闭合型	8	沟通定容型储集层	初期平均日产油24.7 t	10区、12区
水平直线型	5	径向流，均质裂缝-孔洞型储集层，未探测到边界，规模相对较大	供液充足，平均日产油92.0 t	零星分布于各区块
上升直线型	30	储集体规模有限，裂缝或小缝洞体	供液能力不足，多注水替油或间开生产	7区、10区、12区

峰型	峰值个数	峰值两翼特征	缝洞组合结构
尖峰型	1个	两翼基本对称	单一裂缝型
尖峰型	1个	两翼基本对称	单一管道型
缓峰型	1个	上升翼陡，下降翼缓，下降翼明显拖尾	单一溶洞型
			裂缝型串联溶洞型
			管道型串联溶洞型
多峰型	独立多峰	各峰两翼基本对称	裂缝型并联，各并联体流动差异大
		各峰两翼基本对称	管道型并联，各并联体流动差异大
		各峰两翼不对称，上升翼陡，下降翼缓	溶洞型和管道型并联，各并联体流动差异大
	连续多峰	上半峰两翼对称，下降翼拖尾，连续峰值持续时间短	裂缝型并联，各并联体流动差异小
		上半峰两翼对称，下降翼拖尾，连续峰值持续时间短	管道型并联，各并联体流动差异小
		上半峰两翼基本对称，下降翼拖尾明显，连续峰值持续时间长	溶洞型和管道型并联，各并联体流动差异小