本研究於嘉南平原南部台南至高雄北部間利用直流電阻法進行測勘，配合井下地質柱狀圖作適當的逆推分析與資料處理，以探討該範圍內的電性地層結構、沈積環境及海岸線變遷。另外對於小崗山斷層之位置與形態亦進行初步調查。平原地區研究共使用60個垂直電探資料點，34個為前人所測（梅瑞國，1998），26個為作者所測，小崗山斷層通過區域則安排3條地電阻影像剖面測線，經解釋後獲致下列數點結論： 1.綜觀整個測區，西部濱海地區普遍呈現偏低電阻率（低於10歐姆米），推測主要受古潟湖殘留高鹽度海水以及人為超抽地下水導致海水入侵影響。東側丘陵區呈現相對較高電阻（20-30歐姆米），推測應是海水未到達此之故。 2.電阻率在不同深度分布及變化情形，大致呈現東高西低，南北向分布則不明顯。此外，深度100公尺到60公尺這段沈積時期推測為一海進期，小於深度60公尺則為海退期。 3.推測深度60公尺為海進變為海退時期，以此定出當時之海岸線位置大致在今仁德、保安、關廟以西、阿蓮、岡山以東及燕巢以西沿線附近。 4.依電阻率在不同深度之變化，推測台南台地是由沿海之潟湖環境（200-130m）演變為離岸堰洲島（100-40m），再演變為沙丘形態（30-3m）。 5.在深度3公尺到13公尺電阻率水平剖面圖中，二仁溪出口南岸之電阻率小於5歐姆米，其位置推測為古堯港內海範圍。 6.藉由垂直電探資料與水文地質剖面井柱圖之比對，證明台南台地隆起與台南背斜相關，中洲台地形成則與中洲背斜並無太大關係。 7.本研究針對小崗山斷層所做之三條地電阻影像剖面測線，其中之一明顯出現電阻不連續，推測可能為斷層造成，另外兩條則並未發現。 Direct current resistivity method is used to study the electrostratigraphy of the Southern Chia-Nan Plain between Tainan and Northern Kaohsiung. Incorporating of the sounding data with lithological data of wells, the structure of electrical formation and the changes of depositional environment and paleo-shoreline are discussed. Furthermore, the position and status of HsiaoKangShan Fault are also investgated in this study. 60 vertical electrical sounding (VES) and 3 resistivity image profiling (RIP) are carried out in the study area. The results of this study lead to several conclusions as follows: 1. Western region (near sea) of the study area has a very low resistivity (<10Ω-m). It may be caused by high-salty seawater brought by paleo-lagoon and over-pumping groundwater. Eastern region has a relative high resistivity (20-30Ω-m), indicating that area is not covered by paleosea. 2. The changes and distribution of resistivity at different depth indicate that eastern region has higher resistivity than western region in the study area and not obvious in north to south. The period of deposition of the strata from the depth of 100 meters to 60 meters is mainly in transgression period. The deposition period of the strata less than 60 meters is in regression period. 3. The period of the deposition of 60 meters depth between Tainan and Northern Kaohsiung is considered to be the time of transgression to regression. Thereby, the position of paleo-shoreline is around Jendo, Baoan, western Kuanmaio, Alian, Eastern Kangshan, and Western Yanchau. 4. The changes of resistivity at different depth indicate that Tainan Terrace forms from bar lagoon (200-130m), barrier island (100-40m) to dune (30-3m). 5. Distribution of resistivity at 3 meters to 13 meters depth indicates that the low resistivity (<5Ω-m) region at southern outlet of Erhjenchi matchs the range of Yaokang Inland Sea. 6. According to the contrast between VES data and lithological data of wells, Tainan Terrace is lifted by Tainan Anticline and lifting of Chungchou Terrace has little relationship with Chungchou Anticline. 7. Three resistivity image profiling are conducted across HsiaoKangShan Fault. One of them shows obvious discontinuity in resistivity image but the other two do not.
