摘要
川口油田刘渠区块位于鄂尔多斯盆地中部,主力产层是延长组的长4+52层,沉积相以三角洲分流河道为主,为典型特低孔、低渗油藏。该区块水淹水串现象严重,大部分井受效程度差,产量递减快(目前平均单井日产油量为0.35 t/d),面临严峻的稳产形势。为了了解这种现象形成的内在原因,必须将地质、工程研究结合在一起,进行天然裂缝、人工裂缝发育特征等方面的研究。通过研究发现,天然裂缝主要分布在主河道的厚砂体中,初期产能高的油井主要受天然裂缝的影响,因此可根据产能平面分布特征来定性地代表天然裂缝、微裂缝的平面分布特征。
Liuqu block of Chuankou oilfield locates in the middle of Ordos basin, is the low porosity and low permeability reservoir, its main production layer is chang4＋52, and sedimentary facies are the delta distributary channel. This block has very serious flooding water string phenomenon, and most wells suffer poor efficiency, whose production declines rapidly （the average daily oil production of single well just is 0.35 t/d）. So Liuqu block faces the severe situation of stable production. In this paper, in order to understand the inherent reasons of this phenomenon, combined engineering research and geological research, development characteristics of natural fractures and artificial fractures were studied. The results show that, natural fractures are mainly distributed in the thick sand bodies of main channel, and initial high productivity wells are mainly affected by the natural fissures, so the plane distribution of capacity may qualitatively represent the plane distribution of natural fractures and micro cracks.
出处
《辽宁化工》
CAS
2013年第4期406-409,共4页
Liaoning Chemical Industry
关键词
川口油田刘渠区块
天然裂缝
微裂缝
Liuqu block of Chuankou oilfield
natural fracture
micro crack
