塔里木盆地托甫台地区TP12CX走滑断裂构造特征及控储作用Structural characteristics of TP12CX strike-slip faults and the control on reservoirs in Tuofutai area of Tarim Basin
王震,丁文龙,韩鹏远,马海陇
Wang Zhen,Ding Wenlong,Han Pengyuan,Ma Hailong
摘要(Abstract):
塔里木盆地托甫台地区走滑断裂带发育,勘探证实油气成藏明显受控于走滑断裂。为了明确托甫台地区走滑断裂差异活动特征所导致的储层差异,以托甫台地区三维高精度地震资料为基础,对TP12CX走滑断裂带进行了详细的构造变形特征分析、活动强度计算以及活动期次厘定,并综合运用钻井、录井资料,探讨了走滑断裂差异活动特征下对储层的控制作用。结果表明:TP12CX走滑断裂在空间上可分为深、中、浅3套断裂体系,深部以直立、主干走滑断裂为主,中部在地震剖面上可见典型的花状构造,根据力学性质可分为张扭段、压扭段、单断张扭、单断压扭和平移段,张扭段数量最为丰富,浅部为一套、三期受控于深部走滑断裂影响而形成的雁列式正断层;TP12CX走滑断裂带北部平均垂直位移量变化幅度大,正负值交替频繁,各断裂片对应的面长比值高,垂直位移量变化率普遍较大,走滑断裂活动能力较强,而南部活动性相对稳定,活动能力较北部明显较弱;强活动性区域优质储层发育充分,纵向上储层规模大,连续性强,且更易发育受控于断裂作用而产生的断缝系统及断裂空腔。研究结果可为托甫台地区走滑断控型储层勘探开发提供理论支撑。
Strike-slip fault zones are well developed in Tuofutai area of Tarim Basin, and exploration has confirmed that hydrocarbon accumulation is significantly controlled by strike-slip faults. To clarify the reservoir heterogeneity caused by differential activities of strike-slip faults, based on high-precision 3D seismic data from Tuofutai area, detailed analysis is conducted on structural deformation characteristics, activity intensity calculation and activity period determination of TP12CX strike-slip fault zone. Drilling and logging data are integrated to explore the controlling effect of differential strike-slip fault activities on reservoirs. The results show that TP12CX strike-slip fault can be spatially divided into 3 sets of deep, medium, and shallow fault systems. The deep system is dominated by vertical and main strike-slip faults, while the middle system exhibits typical floral structures in seismic profiles, which can be mechanically divided into transtensional, transpressional, single-fault transtension, single-fault transpression and pure strike-slip segments, with transtensional segments being the most abundant. The shallow system consists of a set of en echelon normal faults formed in 3 phases under the influence of deep strike-slip faults. The northern part of TP12CX strike-slip fault zone shows large variations in average vertical displacement, with frequent alternation between positive and negative values, high length ratios of fault segments and significant vertical displacement change rates, indicating strong strike-slip fault activity. In contrast, the southern part shows relatively stable and weaker activity. Highly active areas are characterized by well-developed and high-quality reservoirs, with largescale and vertically continuous reservoirs, which are more prone to develop fracture systems and fracture cavities controlled by fault activities. The research provides theoretical support for exploration and development of strikeslip fault-controlled reservoirs in Tuofutai area.
关键词(KeyWords):
构造特征;活动强度;碳酸盐岩储层;走滑断裂;塔里木盆地
structural characteristics;activity intensity;carbonate reservoirs;strike-slip faults;Tarim Basin
基金项目(Foundation):
作者(Author):
王震,丁文龙,韩鹏远,马海陇
Wang Zhen,Ding Wenlong,Han Pengyuan,Ma Hailong
DOI: 10.19597/J.ISSN.1000-3754.202506010
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