川西南部地区沙溪庙组重点井储层剖析  

DISSECTION ON SAXIMIAO FORMATION KEY WELL RESERVOIR IN WEST SICHUAN SOUTH AREA

作　　者：王勇[1] 蔡开平[1] 

机构地区：[1]中油西南油气田分公司川西北气矿

出　　处：《天然气勘探与开发》2004年第4期9-17,共9页Natural Gas Exploration and Development

基　　金：西南油气田分公司科研课题 (2 0 0 2 0 30 2 - 0 2 - 0 2;川西南部地区沙溪庙组勘探目标评选研究 )部分内容

摘　　要：川西南部地区中侏罗统沙溪庙组的勘探 ,表现为构造钻探成功率高、单井钻探成功率偏低 ,开辟了从重点井分析储层的思路 ,通过以白浅 110井为代表的白马庙构造和其他构造典型井的剖析 ,以及 13口重点井储层对比 ,揭示了沙溪庙组储层的基本地质规律 ,得出储层孔隙发育是产气的物质基础。若配合较优越的初始地质条件 ,如 ,各类级别的油气显示和测井跳波等 ,则测试和生产效果较好 ;储层裂缝越发育、产层段暴露越充分 ,则产量越大 ;人工造缝能提高气井产能 ,当天然裂缝有一定程度发育时 ,其效果可能更好 ;在储层孔隙相对发育 ,录井显示为气侵或者气测异常且无明显跳波时 ,若不用人工造缝 ,也可获得一定产量 ,但一般不高 ;单砂层越厚 ,气产量越大 ,如 ,单砂层厚度适中时 ,若产层数较多、并配合良好显示和附近发育中小断层时 ,一般也能获得商业气流。储层的“裂缝性”和含气砂体的“隐蔽性”Exploration to Middle Triassic Saximiao Formation in west Sichuan south area shows that the success ratio of structural drilling is high, and this ratio for single well is on the low side. Thinking from key well reservoir, dissecting such typical wells as shallow well Bai 110(representing Baimamiao structure) and those of other structures, and reservoir correlating among 13 key wells, the basical geologic rules of Saximiao Formation reservoir have been revealed, and the material foundation of gas production to be reservoir porosity grown is obtained. If coordinating the more favourable initial geologic conditions, such as oil-gas display and logging cycle skip of various grades etc. the result of test and production is better; if the reservoir fracture more growing, producing interval more exposed, then the yield will be greater, artificial fractures can enhance gas well productivity; when natural facture has a definite growth, its effect will be still better; when reservoir porosity is relatively growing, and the logging display is gas invasion or gas logging anomaly and no obvious cycle skip, if not using artificial fracture, a fixed yield may also be obtained, but generally not high; if single sand the thicker, then the greater will be the gas yield; such that the single sand thickness is moderate, if the producing layer number is more and coordinating good display and middle faults to small faults more growing in neighbourhood, generally a commercial gas flow can also be obtained. The “fracturity” of reservoir and the “concealedness” of gas-bearing sand body are basical geologic peculiarities of gas pool.

关 键 词：储层 造缝 气井产能 录井 单井 油气显示 裂缝性 川西 地质规律 钻探 

分 类 号：P618.13[天文地球—矿床学]